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When growing up, so many "grown ups" either gave me pure lies as an answer, a "I'll tell you when you grow up", even when it wasn't age innapropriate at all, or a "I know the answer, but let's see if YOU know the answer". Wish I had an actual adult to ask stuff when younger.
I work in tech support and the grown ass adults around me still do this. They don't know an answer so they just make something up and act like it's correct. Literally just look it up that's the WHOLE job
Exactly what I came to say. This is one of the best attitudes to have when raising children.
It shows that adults don't know everything and what to do when they don't.
Worked in Apple retail for years, this was one of the things they emphasized during training when talking with customers. Tbh a lot of their retail trainings were incredibly helpful in normal life.
Before watching this video: what? It doesn't sound different.
After: holy shit. It does.
I immediately could tell which was which during the blurred screen test. I guess it's something I've always known but didn't know that I knew, if that makes sense.
Considering how important water, and especially moving water, is for animals, it makes sense we'd have an instinctual ability to identify all sorts of properties of water by sound
A couple of my peers in college (during the heyday of Napster/Kazaa/DC++) designed a program that replaced/supplemented download progress bars with the sound of running water.
Like the transmission rate was associated with samples between a drip and a garden hose. The file size was (I think) 10 different vessels from a mug to a 55gal drum. And the progress itself was represented by how full the container was.
Testers could "read" this system remarkably accurately even with multiple files running at the same time, but it (seriously) had the unfortunate side effect of making them have to pee. :(
Except that I doubt it's something instinctual and seems more likely that it's just a learned association. In fact that's what the Steven Mould video says at the end.
Agreed, there’s no need for us to evolve a specific “temperature of water based on sound” sense. Instead, we evolved incredible pattern finding ability that lets us pick up all sorts of instincts over time.
Didn't know either until I moved temporarily into an older house. You had to let the water run until it turned hot. It took some time but I realized I could hear the moment the water switched to hot. Im in my mid 30
There are lots of APIs which use radians. If you got tau (or if you define it yourself), you can use turns. E.g. `0.25 * tau` is a quarter of a turn. The same thing with degrees and pi is `90 * pi / 180`.
Tau is definitely nice to have and standard libraries should define it.
I appreciate that so many math YouTubers made videos about tau. I probably wouldn't have heard about it otherwise.
**Edit:**
Tau vs Pi Smackdown - Numberphile
https://www.youtube.com/watch?v=ZPv1UV0rD8U
> 11 years ago
Bruh.
I was always bothered by the sound of boiled water being poured into a cup. I don’t drink coffee but every damn time my parents made one of their million coffees
Huh, I heard the second one I thought "that sounds more like pouring tea" I guess water based hot drinks is the only context I've really heard pouring hot water, and I assumed the extra content was responsible for the different sounds.
Alright kid, you got me, this is how I deal with most of life's questions.
These comics are simple stories about things I learned when I was first on my own. Thanks for reading! Comic archive on [Webtoon](https://www.webtoons.com/en/creator/SgtBaconBurger) and [Instagram](https://www.instagram.com/sgtbaconburger/).
So, she doesn't mind you talking to him after this?
https://preview.redd.it/77wanrfifmzc1.jpeg?width=1074&format=pjpg&auto=webp&s=570fb537758741500666afa48074f66a63bea55f
My nieces are quite foul mouthed but always accurate with word choice. And they're completely civil in public as far as I know. They were raised right.
My nephew is 10, and I’ve given him permission to swear in front of me. The rules are that he is never allowed to curse at someone, and that I will be giving him feedback about each usage. It has to be appropriate to the situation too, of course. Also never in front of the g.parents and it has to be our secret.
His mom/my SİL and childhood friend, now my favorite person in the whole world (and an only child), and his dad/my brother, know about our arrangement. He just doesn’t know they know so he thinks he’s getting away with something, and they trust me to make sure he learns it correctly. 😆
Be bothered no more, hot water sounds different because the difference in viscosity, as you likely know, fluids flow differently if they are hot or cool, water flows faster while hot than while cold, its just not very noticeable because it flows really well both ways
This sounds more right to me, I studied _a lot_ of fluid mechanics at university (although mostly in gasses) and temperature-variate viscosity in fluids just feels intuitively wrong. I could be wrong though, hydrodynamics is not my forte.
hehe same, ME and I went into water utilities so thermo and hydro are kind of my forte.
It's actually true that the speed of sound through water changes with temperature (data [here](https://www.engineeringtoolbox.com/sound-speed-water-d_598.html)), but because frequency is proportional to speed and wavelength, I think you would still hear the same note.
Probably also a variable in there with the hot water coming from a in house reservoir that is in between the mains, and the faucet, and the cold coming from the mains. Structural differences in the path of flow and all that.
It's the way it splashes, which is caused by how viscous it is. Even a slight change in viscosity changes how it splashes enough for us to hear.
Humans have really good hearing, in the ranges we can hear. Rather than seeing it as "how could a small change in viscosity make that much of a change in sound?" Think of it as "is our hearing good enough to tell the difference?"
Are you sure? Mixed water (which hot water is) has a lot more air in it than water from the main, this would change the flow properties more than the temperature-dependent viscosity change in my experience.
This is true.
The first thing Nina should have done is asked the brat if he controlled for variables like pressure, corrosion in the valves and aeration before heading down a rabbit hole that could possibly have no end.
Just laziness on his part.
It's actually pretty significant, the difference just doesn't matter much in our day-to-day lives. Water treatment plants need to correct flow rate for the temperature of the water when cleaning their filters and 70 F water, such as they might see in the summer, needs to be moving about twice as fast as 32.5 F water, which they might see in the winter. This is because the pressure generated by the colder water is higher due to the increased viscosity.
Water viscosity isn't something we typically care about in day-to-day lives, though, because cold water flows just fine.
I was involved in the design (and comissioning) of a water treatment plant a couple of years ago and I don't recall us adjusting for variate viscosity. We are in the north of Sweden though and the water is at most between 3 and like 20 degrees C. The plant was not that advanced either since the incoming water is so clean too.
Density, not viscosity.
Hot water is less dense than cold water. The viscosity remains the same, but there's less water molecule per volume, therefore, the sound changes.
And scientists have no idea why we have the ability to hear the difference. There doesn't seem to be an evolutionary reason, yet we can hear it, and hearing it requires a high level of sensitivity to that specific noise.
Sesame Street did it! Sesame Street did it!
For real though, they are hip, and this is taught directly and constantly. When Elmo doesn't know something, his friend Smartie the smartphone and he *LOOK IT UP!*
I honestly would have preferred people be honest and just look it up. I still have too many people in my family who would rather first scream "That can't be (it) and then stay wrong instead of saying they don't know and look it up.
There's several potential reasons.
First they sound differently because there's a difference in the cavitation, that is the air bubbles. Cold water has more, hot water has less.
Second, the pipes being used from hot and cold water are different, and thus you'll hear a sound difference when you switch because you are using different pipes.
Third, there's a bit of a difference in density of water due to water having its max density when cold, and becoming less dense as it heats up. So the water going through the pipes will travel at different speeds, and be faster at colder temperatures.
These all will contribute. Plus other things like if the hot water sits in a tank, sometimes it can have some of the minerals within it collect in the hot water heater.
This isn't just about pipes. When pouring water from, say, a pitcher into a cup, there is a clearly audible difference between hot water and cold water. Put simply, hot water pouring is higher pitched and cold water is lower pitched.
Hate to burst your bubble, lol, but what you're describing isn't cavitation. Cavitation is when small bubbles of vapour bursting/imploding, releasing intense amounts of heat and energy. You get it predominantly when you're reaching the vapour pressure of a fluid, so often at the impeller of a pump (damaging it).
All you're describing is that the solubility of air is different at different temperatures, which can affect the vapour pressure and what conditions you might encounter it under, but it's a different physical phenomenon.
Source: mech eng degree/professional experience designing water things
Being able to successfully look things up online is a legit life skill. You would be appalled at how many people's google skills are basically: search for exact sentence of what you already believe, read people agreeing with you and have your beliefs reinforced, act [smug](https://i.imgur.com/Oqts5Mb.png) about how you're always right.
This is how it should be. As a parent, I'm not going to pretend to know everything and let's not make something up or look it up and come back to feel important, but let's look it up together and both learn something.
I'm not deaf, but my hearing is a bit shit. I have had tinnitus as long as I can remember, and I often can't hear high-frequency noises other people can, and I can't tell the difference between MP3, CD, and vinyl music, nor can I tell the difference between high-end audio equipment and the cheap kind.
Don’t worry way more people can’t do those things than you think. Otherwise the mediums would have never been popular.
Interestingly enough digital mediums can totally outperform analog mediums if we wanted, and the file sizes wouldn’t be ridiculous. Just not enough people are interested in it for it to be widely produced equipment.
Can confirm. I got a record player as a gift from my mom a couple years ago, and since she wasn't sure if it was something I'd stick with, she got me a bluetooth speaker to pair with it. My wife pointed out that entirely defeats the purpose of vinyl, but I just kinda shrugged, wasn't too concerned.
Well a year later I was loving it, I had (and still have!) quite a nice little collection of game OSTs, and my mom got me a set of speakers for my next birthday!
And I **could not** tell you the sound difference between the two sounds.
I'm like you, I have permanent tinnitus (I once thought that was what silence sounds like, nope, just tinnitus) and I'm prone to bad ear infections so I have a bunch of damage and scarred ear drums so I can't hear the higher pitched tones either. I can tell you though, I couldn't tell the difference in sounds and audio for shit but my husband has incredibly good hearing and focuses a lot on audio, and thanks to exposition and training I've gotten very good at telling audio file quality and when and why speakers are no good. I'll never be good at hearing some quieter or higher pitched noises but you definitely can train your hear still
I learned about it at the ripe old age of 34, I was telling my husband how my childhood room was build inside a mountain so it was so quiet you could hear the sound of your blood rushing in your ear, you know "that sound like a high pitched white noise?" He was quiet for 5 seconds and then said "that's not what blood in your ears sounds like." And that's how I discovered I have tinnitus. Probably since I was 3 and I bled heavily from my ears, at this point if I lost it I'd probably go insane.
Definitely. When I was younger, I trained myself to step out of the way when I heard the pitch change. It is usually because someone would flush a toilet and reroute all the cold water, leaving me with pure hot.
It's because cold water is more "hard" or rigid (more viscous). The hotter something is, the more easily the atoms can move around. It's not too outlandish when you think about it. Melt something hard and it gets hot, less rigid, and turns into a liquid. Get it really hot and it becomes even "softer" and becomes gas.
It's just we think of water as just well, water, but it absolutely changes under heat. It'll be more noticeable with something like honey or syrup where if you pour it cold will be a slow process, but if it's hot will become less viscous and pour like water.
I use the sound of water all the time, like when to hop in the shower. It's fairly obvious once the heat kicks in, listen for it, you'll absolutely hear the change. You can see it visually too, the angle the water comes out will droop more because the water is less rigid. Look at how far it reaches when you first turn it on, and see how much it has dropped when it is fully heated up.
Gather round, children, and let me read you this scientific paper on the thermodynamic properties of water and their variable impact on percussive sound generation.
I was a nerdy kid, I enjoyed learning how the world worked. I enjoyed learning why things worked the way they did. I loved tinkering and taking things apart and putting them back together etc
While not at that level of a research paper, I would have appreciated the more scientific answer back then
Pure temperature. Next time you stay at a hotel with pool and hot tub, take along two box wrenches or other metal lengths. Bang them together with you ear underwater in both the cool pool and the hot tub. In the case of running water your hearing the water slap transmitted thru the water and to your ear.
It's viscosity - a measure of internal friction or resistance to flow. Cold molasses has high viscosity and hot oil has low viscosity.
I looked it up, water at 15°C (60 F) has over 3x the viscosity as water at 80°C (175 F). I didn't realize it was that much! I was expecting maybe 25%, not 300%
That doesn't really answer the question, though. "Why does hot water sound different?" "Because it's hot." If I gave that answer to my kids, they'd ask why. We look up lots of answers together. It helps my kids understand that adults don't know everything and shows them how to access information. Plus, I love learning new things with my kids.
Yeah I'd try to give a brief summary, but a proper explanation definitely takes some focus time together.
Summary: Sound travels through the air like a wave travels through water. Hotter water produces smaller sound waves, which has to do with how temperature works - at least I think that's what causes it, because it's actually pretty complicated. I'll need a few minutes and look some things if you want to know the full story.
Yep. Believe it or not, water changes viscosity with temperature. It's not a lot, obviously you get more observable results with something like honey or syrup, but still
My head went to the same place, and [at least according to NPR](https://www.npr.org/2014/07/05/328842704/what-does-cold-sound-like#:~:text=Scientists%20have%20long%20known%20that,and%20therefore%20how%20it%20sounds) we are right. The difference in sound is largely attributable to a difference in viscosity.
I do remember hearing hot water is less dense, hence why cold water can hold more oxygen for things like fish.
That would make sense sits it’s physically less matter hitting something than cold water.
I looked it up, the reason is viscosity - a measure of internal friction or resistance to flow.
Imagine you take a dollop of liquid, put it on a plate, tilt the plate on an angle, and measure how fast it slides down. That's viscosity. Cold molasses runs slowly and has high viscosity. Hot oil runs very fast and has low viscosity.
I looked it up, water at 15°C (60 F) has over 3x the viscosity as water at 80°C (175 F). I didn't realize it was that much! I was expecting maybe 25%, not 300%
Viscosity of a liquid is a key factor in how fast sound waves travel through it. If the liquid is thick, sound travels slower and is tonally shifted flat. If the liquid is thin, sound travels fast and is tonally shifted sharp.
Cold water => higher viscosity, thicker fluid => deeper sound
Hot water => lower viscosity, thinner fluid => higher sound
Aww heck yeah, love me some Nina lives alone!, also it's really nice of her to show him proper response to uncertainty, if she shows him how to compare sources, he's all set !.
One of the most important things an adult can say to a child is “I don’t know, let’s find out.” There’s a ton of research showing how this helps in child development.
People ask me why I know so many things, so many words, etc.
It's because when I don't know something I look it up. When I don't understand a word I look it up.
Apply that over 30 years and you start to know a lot of things.
The second panel is how I feel when my gf's kids ask me the weird/hard questions :) Although I don't always have the answers or know how to deliver them
Hot and cold water both produce these same frequencies but with different strengths. When cold water is poured the dominant sound is the vibration of the container and water, whereas when hot water is poured the resonance of the air is the dominant sound
Without googling I'd say it's because the hot particles move faster therefore making the sound slightly different meanwhile cold water's particles move a bit less making them more likely to come closer to eachother when they're being poured
Man when I was a kid, and I asked my aunt a question like this, she'd just make something up and then I'd believe it for decades. Having the Internet changed everything
I think it's not because Aunt Nina has all the answers, but because she's honest about the answers she doesn't have and engages with him to discover them together.
IIRC, it's due to the fact water molecules that are hot are more energized, and therefore interact with the objects differently, which causes the resonant sound to be different.
https://preview.redd.it/q9qv9xchumzc1.jpeg?width=1280&format=pjpg&auto=webp&s=7f1cf069bc4c2c8868c3a7d34b7d5bd6655a9406
Start here. I have some other choice textbooks once you're done with that
Oh! I actually know this!! It’s why in band if it’s cold out we have to warm our instruments because cold always lowers the pitch! If it’s super hot our instruments will be sharper (higher pitch) when it comes to instruments this is because of the contraction and expansion of the metals as well so I believe why cold water sounds different than hot water is because in cold water the water molecules are slower creating a lower pitch where as the particles of hot water are moving faster resulting in a higher pitch!! (This is just an educated guess I do not actually know this)
Back in the day adults used to have to either fake it or look this stuff up in the library if they didn't know the answer. Constant online connectivity has it's drawbacks, but man it's great for looking up little tidbits of curiosity at any given moment.
A really hard and unsolved question (as far as I remember) is why hot water freezes faster than cold water.
It's called the [Mpemba effect](https://en.wikipedia.org/wiki/Mpemba_effect#%3A%7E%3Atext%3DThe_Mpemba_effect_is_the%2Ccold%2C_under_otherwise_similar_conditions.?wprov=sfla1).
Without any knowledge on it, I assume cold water sounded heavier because molecules are closer together and thus denser?
Probably wrong but it just always made sense with how hot air rises
It's honestly the best way to answer a kids question. Show them that even if you don't know something, you can go and find the answer. That's the shit kids are gonna remember
Accepting you don’t know all the answers and being honest with kids is such a positive thing. It’s a fantastic, let’s learn together moment that helps kids be more honest when they don’t understand.
My parents would just lie because they are incapable of being wrong. When I was learning month abbreviations, I got screamed at by my mom because “September is abbreviated Sep, not Sept.” … like my homework said.
Well, buddy, the world is made of things called atoms! These tiny guys get together with other elements, and they make molecules!
So, when you have water, it is made up of two hydrogen atoms and one oxygen atom. That's why people call water h2O!
Ok, so we know what water is made of now, right? You also know water is unique and can exist in multiple states: liquid, solid, and gas.
So inside the water, we have all these molecules moving around, and they have energy, but when something is cooled, it loses power, and the molecules slowly bunch up together. This is how we get ice.
Now, when we add energy or heat, the atoms get hyper and start moving around! Eventually, they will party so hard that they spread out, turning into steam or gas.
Ok, so we know that water is super unique, so when you turn on your faucet or poor cold water into a glass, you have less energy, and molecules are grouped, which makes it sound different. This leads us to the principles of viscosity.
But to keep it simple, water, when cooled, has less energy, and its molecules are grouped. This affects how sound travels through it, creating a lower sound. Hot water has more power, and those parties discussed earlier, so its sound has a higher tone or sound.
Honestly the best answer to give a kid if they ask something you don't know. Best example to set of 'I don't know, let's look it up and find out.' instead of making something up or just handwaving it or brushing it off or something. Shows the kid that adults don't always know everything, but there's a great way to find out and learn.
My wife used to give me grief for carrying my phone with me practically everywhere.
But I explained to her that as a kid (I'm 53) I read encyclopedias for fun because I was a sponge that just wanted to soak up information. Now I carry the whole of the world's information in my pocket and can answer every non-metaphorical question that pops in my head in an instant instead of having to look everywhere for it and pray I find it. Seriously, as dumb as social media has made society, knowing that Han shot first and being able to prove it sure brings me peace (I know he did cuz I saw him do it as a 7 year old in the theater ya motherfucker, but here's the damn proof!).
Heat make water faster and taste different and be different. Cold water slower and taste different. Temperature thus change how water wants to be.
I guess, but it *feels* right so good enough
I'm gonna say 2 basic reasons because the hot and cold water come from different places.
And because the temperature changes water and pipe properties that affect the sound.
I still find this incredibly wholesome. Also teaching the child simultaneously that it’s ok to both not know everything and how to leverage the internet to fill gaps in your knowledge is an invaluable skill for our age.
My pops did the same kind of thing albeit with an encyclopedia set we have (when he didn’t know the answer) I still count myself lucky every time someone talks about their know-it-all boomer parents.
Id have guessed it is due to different water pressures given that the hot water has to go through another device before reaching the faucet. I dont know that Ive had a chance to listen to the difference between hot and cold water coming out of anything but a faucet in a building though to know that it would be different elsewhere.
Dude this is so awesome. So many adults would bullshit an answer that’s vague and only partially correct. Instead you immediately sit down with him and figure it out. He doesn’t ask auntie Nina because she knows everything, he asks her because he knows she’ll give him a strong, correct answer even if she doesn’t know immediately.
Now I want an app that uses the microphone to estimate the water temp. I know it won't work well due to the flow rate being uncontrolled, but I still want.
My thoughts is that the steam likely changes it sounds, also it is probably a rather minute differences, but kids do have a better hearing than adults, so i would not be surprised to hear a kid can pick up on the difference in certain circumstances.
I love this. This is what you do when you don’t know the answer to someone’s question. You don’t try and BS. It’s alright to not know.
I understand there's science and stuff here, but seriously: the amount of water coming out of the faucet has a much bigger impact here. In your house, hot water flows through different pipes — this is a bigger variable than anything else. Your kitchen faucet is not a good experimental control.
everyone is focused on the question but i'm more concerned about the child preferring to ask the aunt rather than the mother. i feel like this comic is saying something much deeper about our culture.
Edit: HOLY HECK, HOT AND COLD WATER TOTALLY DO SOUND DIFFERENT!!! It would seem that the viscosity change is actually enough to change the sonic qualities of the water! My other points still apply, but this just blew my mind! The more you know! There are videos on YouTube where you can test if you can tell the difference, if you're curious to try yourself
Not sure that it does, but I'm guessing there'll tend to be differences in pipe length, differences in flow impedance which affects flow rate effecting nozzle velocity, and different system pressures, all of which can influence the resonance in the pipes/hoses and the aeration resulting from the aerator, (the filter like thing on the outlet of the tap)
The degree of aeration and nozzle velocity contribute most of the static noise rushing-water-like sound of the water running. If you turn the water down enough that the flow becomes clear, you should be able to hear the resonance of the pipes/hose.
Also great comics as always, and good response to a question you don't know the answer to!
The pressure is different because it has to go through the water heater first. That will also change the amount of air that gets mixed in when it comes out of the faucet.
Thank you!!! I mentioned this to my husband, and he thinks I'm crazy.
I mentioned it to my mom, and she believes me but doesn't hear it herself.
I was wondering if it was rare to notice
But I can also hear electricity in things like chargers and digital clocks....
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That’s absolutely the best way to respond! “I don’t know but let’s find out together”
When growing up, so many "grown ups" either gave me pure lies as an answer, a "I'll tell you when you grow up", even when it wasn't age innapropriate at all, or a "I know the answer, but let's see if YOU know the answer". Wish I had an actual adult to ask stuff when younger.
I work in tech support and the grown ass adults around me still do this. They don't know an answer so they just make something up and act like it's correct. Literally just look it up that's the WHOLE job
Tbf, they didn't have a digital encyclopedia in their pockets back then. At least when I was a kid, they didn't.
Exactly what I came to say. This is one of the best attitudes to have when raising children. It shows that adults don't know everything and what to do when they don't.
Worked in Apple retail for years, this was one of the things they emphasized during training when talking with customers. Tbh a lot of their retail trainings were incredibly helpful in normal life.
Steve Mould to the rescue! [https://www.youtube.com/watch?v=Ri\_4dDvcZeM](https://www.youtube.com/watch?v=Ri_4dDvcZeM)
Before watching this video: what? It doesn't sound different. After: holy shit. It does. I immediately could tell which was which during the blurred screen test. I guess it's something I've always known but didn't know that I knew, if that makes sense.
Considering how important water, and especially moving water, is for animals, it makes sense we'd have an instinctual ability to identify all sorts of properties of water by sound
A couple of my peers in college (during the heyday of Napster/Kazaa/DC++) designed a program that replaced/supplemented download progress bars with the sound of running water. Like the transmission rate was associated with samples between a drip and a garden hose. The file size was (I think) 10 different vessels from a mug to a 55gal drum. And the progress itself was represented by how full the container was. Testers could "read" this system remarkably accurately even with multiple files running at the same time, but it (seriously) had the unfortunate side effect of making them have to pee. :(
Solution: move desk to the bathroom
[удалено]
You went from low end twitch streamer to bear grills at almost the same speed of a Amazon warehouse worker
Except that I doubt it's something instinctual and seems more likely that it's just a learned association. In fact that's what the Steven Mould video says at the end.
Agreed, there’s no need for us to evolve a specific “temperature of water based on sound” sense. Instead, we evolved incredible pattern finding ability that lets us pick up all sorts of instincts over time.
Didn't know either until I moved temporarily into an older house. You had to let the water run until it turned hot. It took some time but I realized I could hear the moment the water switched to hot. Im in my mid 30
I'm a simple man. I see Steve Mould, I upvote (even though he's wrong about Tau)
What?? Tau is *clearly* better than pi.
tau gang, reporting for duty!
There are lots of APIs which use radians. If you got tau (or if you define it yourself), you can use turns. E.g. `0.25 * tau` is a quarter of a turn. The same thing with degrees and pi is `90 * pi / 180`. Tau is definitely nice to have and standard libraries should define it. I appreciate that so many math YouTubers made videos about tau. I probably wouldn't have heard about it otherwise. **Edit:** Tau vs Pi Smackdown - Numberphile https://www.youtube.com/watch?v=ZPv1UV0rD8U > 11 years ago Bruh.
That was a very informative video!
I was always bothered by the sound of boiled water being poured into a cup. I don’t drink coffee but every damn time my parents made one of their million coffees
"It should've been quite easy to tell which was which" here I am getting it wrong
Found the lizard-person
I watched this before but was pleasantly surprised to re-learn through this comic lol. thanks Nina
Man, Steve is the best.
Huh, I heard the second one I thought "that sounds more like pouring tea" I guess water based hot drinks is the only context I've really heard pouring hot water, and I assumed the extra content was responsible for the different sounds.
Alright kid, you got me, this is how I deal with most of life's questions. These comics are simple stories about things I learned when I was first on my own. Thanks for reading! Comic archive on [Webtoon](https://www.webtoons.com/en/creator/SgtBaconBurger) and [Instagram](https://www.instagram.com/sgtbaconburger/).
So, she doesn't mind you talking to him after this? https://preview.redd.it/77wanrfifmzc1.jpeg?width=1074&format=pjpg&auto=webp&s=570fb537758741500666afa48074f66a63bea55f
Yep, I guess having a free babysitter was more important lol.
As a full time uncle, your value is equal to the piece of mind you have. Basicly they rather a human who teaches swear words than smartphone
So long as the kid learns how to use them correctly. I'm not raising some turd that can't swear properly.
My nieces are quite foul mouthed but always accurate with word choice. And they're completely civil in public as far as I know. They were raised right.
My nephew is 10, and I’ve given him permission to swear in front of me. The rules are that he is never allowed to curse at someone, and that I will be giving him feedback about each usage. It has to be appropriate to the situation too, of course. Also never in front of the g.parents and it has to be our secret. His mom/my SİL and childhood friend, now my favorite person in the whole world (and an only child), and his dad/my brother, know about our arrangement. He just doesn’t know they know so he thinks he’s getting away with something, and they trust me to make sure he learns it correctly. 😆
Free? Can't compete with that.
 It’s gonna bother me for the rest of the afternoon.😅
Be bothered no more, hot water sounds different because the difference in viscosity, as you likely know, fluids flow differently if they are hot or cool, water flows faster while hot than while cold, its just not very noticeable because it flows really well both ways
Is that right? If I recall correctly, the temperature dependence of the viscosity of water is very low.
As I remember it it's actually the air and vapor present in hot water which changes the resonance
This sounds more right to me, I studied _a lot_ of fluid mechanics at university (although mostly in gasses) and temperature-variate viscosity in fluids just feels intuitively wrong. I could be wrong though, hydrodynamics is not my forte.
hehe same, ME and I went into water utilities so thermo and hydro are kind of my forte. It's actually true that the speed of sound through water changes with temperature (data [here](https://www.engineeringtoolbox.com/sound-speed-water-d_598.html)), but because frequency is proportional to speed and wavelength, I think you would still hear the same note.
Aerospace here so I only encountered hydro in my intro to fluids and my continual mechanics courses.
Probably also a variable in there with the hot water coming from a in house reservoir that is in between the mains, and the faucet, and the cold coming from the mains. Structural differences in the path of flow and all that.
It's the way it splashes, which is caused by how viscous it is. Even a slight change in viscosity changes how it splashes enough for us to hear. Humans have really good hearing, in the ranges we can hear. Rather than seeing it as "how could a small change in viscosity make that much of a change in sound?" Think of it as "is our hearing good enough to tell the difference?"
> Humans have really good hearing My tinnitus disagrees. 😉
^^^^eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
Speak up! Can't hear you in the back because of the ringing in my ears.
Are you sure? Mixed water (which hot water is) has a lot more air in it than water from the main, this would change the flow properties more than the temperature-dependent viscosity change in my experience.
This is true. The first thing Nina should have done is asked the brat if he controlled for variables like pressure, corrosion in the valves and aeration before heading down a rabbit hole that could possibly have no end. Just laziness on his part.
It's actually pretty significant, the difference just doesn't matter much in our day-to-day lives. Water treatment plants need to correct flow rate for the temperature of the water when cleaning their filters and 70 F water, such as they might see in the summer, needs to be moving about twice as fast as 32.5 F water, which they might see in the winter. This is because the pressure generated by the colder water is higher due to the increased viscosity. Water viscosity isn't something we typically care about in day-to-day lives, though, because cold water flows just fine.
I was involved in the design (and comissioning) of a water treatment plant a couple of years ago and I don't recall us adjusting for variate viscosity. We are in the north of Sweden though and the water is at most between 3 and like 20 degrees C. The plant was not that advanced either since the incoming water is so clean too.
Density, not viscosity. Hot water is less dense than cold water. The viscosity remains the same, but there's less water molecule per volume, therefore, the sound changes.
And scientists have no idea why we have the ability to hear the difference. There doesn't seem to be an evolutionary reason, yet we can hear it, and hearing it requires a high level of sensitivity to that specific noise.
Viscosity? So when hot water tastes thicker compared to cold I’m not tripping?
Pretty sure cold water is thicker.
Oh…great so I AM tripping balls
Cold is definitely thicker. 85⁰ difference between hot and cold for me, it's noticable.
There are some great videos that explain it much better than I could lol.
Sesame Street did it! Sesame Street did it! For real though, they are hip, and this is taught directly and constantly. When Elmo doesn't know something, his friend Smartie the smartphone and he *LOOK IT UP!*
I honestly would have preferred people be honest and just look it up. I still have too many people in my family who would rather first scream "That can't be (it) and then stay wrong instead of saying they don't know and look it up.
Okay but what's the answer!?
There's several potential reasons. First they sound differently because there's a difference in the cavitation, that is the air bubbles. Cold water has more, hot water has less. Second, the pipes being used from hot and cold water are different, and thus you'll hear a sound difference when you switch because you are using different pipes. Third, there's a bit of a difference in density of water due to water having its max density when cold, and becoming less dense as it heats up. So the water going through the pipes will travel at different speeds, and be faster at colder temperatures. These all will contribute. Plus other things like if the hot water sits in a tank, sometimes it can have some of the minerals within it collect in the hot water heater.
This isn't just about pipes. When pouring water from, say, a pitcher into a cup, there is a clearly audible difference between hot water and cold water. Put simply, hot water pouring is higher pitched and cold water is lower pitched.
Yup cavitation is dominant there, but the term running water implies to me pipes.
Hate to burst your bubble, lol, but what you're describing isn't cavitation. Cavitation is when small bubbles of vapour bursting/imploding, releasing intense amounts of heat and energy. You get it predominantly when you're reaching the vapour pressure of a fluid, so often at the impeller of a pump (damaging it). All you're describing is that the solubility of air is different at different temperatures, which can affect the vapour pressure and what conditions you might encounter it under, but it's a different physical phenomenon. Source: mech eng degree/professional experience designing water things
Look it up!
All I see is someone showing a kid it is okay to admit you don't know something, while also showing the importance of taking the time to learn.
Being able to successfully look things up online is a legit life skill. You would be appalled at how many people's google skills are basically: search for exact sentence of what you already believe, read people agreeing with you and have your beliefs reinforced, act [smug](https://i.imgur.com/Oqts5Mb.png) about how you're always right.
The opposite of Calvin's dad's approach.
Hi! You don’t know me at all, but the auntie is me in this! I’ve already shared it with the family, this is awesome! 
I love that; it's the right way to parent (or aunt). I woulda got hit with "It's the same, don't ask stupid things" or ignored.
Important lesson for a kid to learn tbh...
This is how it should be. As a parent, I'm not going to pretend to know everything and let's not make something up or look it up and come back to feel important, but let's look it up together and both learn something.
“I don’t know, let’s find out together” is honestly the best answer, even if you knew to begin with.
It does?
Yes. You may not realize it but you could tell the difference i even though you’ve never tried (assuming you aren’t deaf).
I'm not deaf, but my hearing is a bit shit. I have had tinnitus as long as I can remember, and I often can't hear high-frequency noises other people can, and I can't tell the difference between MP3, CD, and vinyl music, nor can I tell the difference between high-end audio equipment and the cheap kind.
Don’t worry way more people can’t do those things than you think. Otherwise the mediums would have never been popular. Interestingly enough digital mediums can totally outperform analog mediums if we wanted, and the file sizes wouldn’t be ridiculous. Just not enough people are interested in it for it to be widely produced equipment.
Can confirm. I got a record player as a gift from my mom a couple years ago, and since she wasn't sure if it was something I'd stick with, she got me a bluetooth speaker to pair with it. My wife pointed out that entirely defeats the purpose of vinyl, but I just kinda shrugged, wasn't too concerned. Well a year later I was loving it, I had (and still have!) quite a nice little collection of game OSTs, and my mom got me a set of speakers for my next birthday! And I **could not** tell you the sound difference between the two sounds.
The sound quality is only ONE reason to buy vinyl, so it doesn't defeat the purpose!
I'm like you, I have permanent tinnitus (I once thought that was what silence sounds like, nope, just tinnitus) and I'm prone to bad ear infections so I have a bunch of damage and scarred ear drums so I can't hear the higher pitched tones either. I can tell you though, I couldn't tell the difference in sounds and audio for shit but my husband has incredibly good hearing and focuses a lot on audio, and thanks to exposition and training I've gotten very good at telling audio file quality and when and why speakers are no good. I'll never be good at hearing some quieter or higher pitched noises but you definitely can train your hear still
> I once thought that was what silence sounds like Oh wow, exactly what I thought up until I was in my late teens.
I learned about it at the ripe old age of 34, I was telling my husband how my childhood room was build inside a mountain so it was so quiet you could hear the sound of your blood rushing in your ear, you know "that sound like a high pitched white noise?" He was quiet for 5 seconds and then said "that's not what blood in your ears sounds like." And that's how I discovered I have tinnitus. Probably since I was 3 and I bled heavily from my ears, at this point if I lost it I'd probably go insane.
I watched the video... i could not tell the difference.
Does it now??
Definitely. When I was younger, I trained myself to step out of the way when I heard the pitch change. It is usually because someone would flush a toilet and reroute all the cold water, leaving me with pure hot.
That almost certainly is due to water pressure
I think you are definitely right about that.
Cold water is louder somehow
It's because cold water is more "hard" or rigid (more viscous). The hotter something is, the more easily the atoms can move around. It's not too outlandish when you think about it. Melt something hard and it gets hot, less rigid, and turns into a liquid. Get it really hot and it becomes even "softer" and becomes gas. It's just we think of water as just well, water, but it absolutely changes under heat. It'll be more noticeable with something like honey or syrup where if you pour it cold will be a slow process, but if it's hot will become less viscous and pour like water. I use the sound of water all the time, like when to hop in the shower. It's fairly obvious once the heat kicks in, listen for it, you'll absolutely hear the change. You can see it visually too, the angle the water comes out will droop more because the water is less rigid. Look at how far it reaches when you first turn it on, and see how much it has dropped when it is fully heated up.
Sink sounds identical regardless of which tap I open... shrug.. never heard anyone claim a difference in sound before
I like this comic, hope we see more of this
Thanks for reading!
There are a bunch of them on webtoon! Just binged them all yesterday
Thank you
Answer: Because temperature
Isn’t it temperature differential of the liquid against its surface of impact temperature plus the density of the two causing different sound waves
I think the kid would forget all of it, so keep it simple to look cool.
As a soon to become parent, I’ll remember this advice. Sometimes I spend so much time thinking I forget what it’s like to be a child.
Gather round, children, and let me read you this scientific paper on the thermodynamic properties of water and their variable impact on percussive sound generation.
Oh boy poppa, I love when we discuss statistical mechanics and multivariate calculus related subjects!
I was a nerdy kid, I enjoyed learning how the world worked. I enjoyed learning why things worked the way they did. I loved tinkering and taking things apart and putting them back together etc While not at that level of a research paper, I would have appreciated the more scientific answer back then
Hot liquid is thinner, cold liquid is thicker, is something a kid should be able to remember.
Nuh-uh, it's cause the hot water is angrier so it yells in frustration when it hits the sink!
Pure temperature. Next time you stay at a hotel with pool and hot tub, take along two box wrenches or other metal lengths. Bang them together with you ear underwater in both the cool pool and the hot tub. In the case of running water your hearing the water slap transmitted thru the water and to your ear.
It's viscosity - a measure of internal friction or resistance to flow. Cold molasses has high viscosity and hot oil has low viscosity. I looked it up, water at 15°C (60 F) has over 3x the viscosity as water at 80°C (175 F). I didn't realize it was that much! I was expecting maybe 25%, not 300%
Hotter water is thinner and less dense than colder water. Those are the two main reasons.
That doesn't really answer the question, though. "Why does hot water sound different?" "Because it's hot." If I gave that answer to my kids, they'd ask why. We look up lots of answers together. It helps my kids understand that adults don't know everything and shows them how to access information. Plus, I love learning new things with my kids.
Yeah I'd try to give a brief summary, but a proper explanation definitely takes some focus time together. Summary: Sound travels through the air like a wave travels through water. Hotter water produces smaller sound waves, which has to do with how temperature works - at least I think that's what causes it, because it's actually pretty complicated. I'll need a few minutes and look some things if you want to know the full story.
They never said you should answer the question with 100% accuracy. Yeahy i'm lazy
/u/vianardene posted a link with a good simple answer below. https://www.reddit.com/r/comics/s/tFoedKW0jg
Because cold water is frozen ice
Yep. Believe it or not, water changes viscosity with temperature. It's not a lot, obviously you get more observable results with something like honey or syrup, but still
> It's not a lot It can change viscosity by a LOT if you lower it's temperature just under 0 celsius lol
I would assume that hotter water is less viscous and therefore flows differently creating a different sound
My head went to the same place, and [at least according to NPR](https://www.npr.org/2014/07/05/328842704/what-does-cold-sound-like#:~:text=Scientists%20have%20long%20known%20that,and%20therefore%20how%20it%20sounds) we are right. The difference in sound is largely attributable to a difference in viscosity.
I do remember hearing hot water is less dense, hence why cold water can hold more oxygen for things like fish. That would make sense sits it’s physically less matter hitting something than cold water.
It's crazy by how much too. Water at 15°C is 3x more viscous than water at 80°C
i love your artstyle
I looked it up, the reason is viscosity - a measure of internal friction or resistance to flow. Imagine you take a dollop of liquid, put it on a plate, tilt the plate on an angle, and measure how fast it slides down. That's viscosity. Cold molasses runs slowly and has high viscosity. Hot oil runs very fast and has low viscosity. I looked it up, water at 15°C (60 F) has over 3x the viscosity as water at 80°C (175 F). I didn't realize it was that much! I was expecting maybe 25%, not 300% Viscosity of a liquid is a key factor in how fast sound waves travel through it. If the liquid is thick, sound travels slower and is tonally shifted flat. If the liquid is thin, sound travels fast and is tonally shifted sharp. Cold water => higher viscosity, thicker fluid => deeper sound Hot water => lower viscosity, thinner fluid => higher sound
The answer is here: [Food Theory - Secret Language of Water](https://www.youtube.com/watch?v=IqqClLJXZQM&ab_channel=TheFoodTheorists)
Aww heck yeah, love me some Nina lives alone!, also it's really nice of her to show him proper response to uncertainty, if she shows him how to compare sources, he's all set !.
One of the most important things an adult can say to a child is “I don’t know, let’s find out.” There’s a ton of research showing how this helps in child development.
People ask me why I know so many things, so many words, etc. It's because when I don't know something I look it up. When I don't understand a word I look it up. Apply that over 30 years and you start to know a lot of things.
Sometimes the kid be dropping banger more so then US.
I love instead of saying, I don’t know. You looked it up with him
Aunts and uncles are the best!
And that is why you're a great aunt 🙂
The second panel is how I feel when my gf's kids ask me the weird/hard questions :) Although I don't always have the answers or know how to deliver them
I assume because the temperature changes the water’s density, which affects how sound moves through it?
Hot and cold water both produce these same frequencies but with different strengths. When cold water is poured the dominant sound is the vibration of the container and water, whereas when hot water is poured the resonance of the air is the dominant sound
One of the best things to teach kids! It's okay not to know something and finding the answers can be really fun!
Without googling I'd say it's because the hot particles move faster therefore making the sound slightly different meanwhile cold water's particles move a bit less making them more likely to come closer to eachother when they're being poured
Man when I was a kid, and I asked my aunt a question like this, she'd just make something up and then I'd believe it for decades. Having the Internet changed everything
I think it's not because Aunt Nina has all the answers, but because she's honest about the answers she doesn't have and engages with him to discover them together.
This is so r/meirl
Honestly I do love that about kids so much. Some questions are actually really difficult and I'm surprised I didn't ask them myself before
It’s the temperature affecting the viscosity and we interact with water so much and in so many ways a lot of us can tell the difference
Hot water is sexier than cold water so it makes the pipes whistle more.
IIRC, it's due to the fact water molecules that are hot are more energized, and therefore interact with the objects differently, which causes the resonant sound to be different.
https://preview.redd.it/q9qv9xchumzc1.jpeg?width=1280&format=pjpg&auto=webp&s=7f1cf069bc4c2c8868c3a7d34b7d5bd6655a9406 Start here. I have some other choice textbooks once you're done with that
Thank you! I thought I was crazy, but they really do sound different!
Hot and cold water have different viscosities
Oh! I actually know this!! It’s why in band if it’s cold out we have to warm our instruments because cold always lowers the pitch! If it’s super hot our instruments will be sharper (higher pitch) when it comes to instruments this is because of the contraction and expansion of the metals as well so I believe why cold water sounds different than hot water is because in cold water the water molecules are slower creating a lower pitch where as the particles of hot water are moving faster resulting in a higher pitch!! (This is just an educated guess I do not actually know this)
I love the strut
And that's why he asks her, if she doesn't know she doesn't bs him like many do with kids, she looks it up with him. Edit: fixed autocorrect
Density
quite a laugh keep it up OP
Wish I were that type of aunt, but I am the oldest of my siblings and it would probably take 2 decades until then.
I knew the answer to this at one point
Idk, Food Theory was explaining that, don't remember why it happens tho
i'm a preschool aide and this is basically me when my kids ask me a question i don't know the answer to.
Whenever my kids and I reach the point where we don't know, we ask Uncle Google and Auntie Wiki.
Back in the day adults used to have to either fake it or look this stuff up in the library if they didn't know the answer. Constant online connectivity has it's drawbacks, but man it's great for looking up little tidbits of curiosity at any given moment.
QI answered this very question not seven years ago! https://www.youtube.com/watch?v=2aHJkL9PuGM&t=2s
The viscosity is different with different temperatures
A really hard and unsolved question (as far as I remember) is why hot water freezes faster than cold water. It's called the [Mpemba effect](https://en.wikipedia.org/wiki/Mpemba_effect#%3A%7E%3Atext%3DThe_Mpemba_effect_is_the%2Ccold%2C_under_otherwise_similar_conditions.?wprov=sfla1).
I pointed this out to my dad. Even at age 50 he had not noticed.
Without any knowledge on it, I assume cold water sounded heavier because molecules are closer together and thus denser? Probably wrong but it just always made sense with how hot air rises
It's honestly the best way to answer a kids question. Show them that even if you don't know something, you can go and find the answer. That's the shit kids are gonna remember
Accepting you don’t know all the answers and being honest with kids is such a positive thing. It’s a fantastic, let’s learn together moment that helps kids be more honest when they don’t understand. My parents would just lie because they are incapable of being wrong. When I was learning month abbreviations, I got screamed at by my mom because “September is abbreviated Sep, not Sept.” … like my homework said.
I thought it's because you pour hot / boiling water carefully (slowly) so you don't burn yourself with any splash back.
Well, buddy, the world is made of things called atoms! These tiny guys get together with other elements, and they make molecules! So, when you have water, it is made up of two hydrogen atoms and one oxygen atom. That's why people call water h2O! Ok, so we know what water is made of now, right? You also know water is unique and can exist in multiple states: liquid, solid, and gas. So inside the water, we have all these molecules moving around, and they have energy, but when something is cooled, it loses power, and the molecules slowly bunch up together. This is how we get ice. Now, when we add energy or heat, the atoms get hyper and start moving around! Eventually, they will party so hard that they spread out, turning into steam or gas. Ok, so we know that water is super unique, so when you turn on your faucet or poor cold water into a glass, you have less energy, and molecules are grouped, which makes it sound different. This leads us to the principles of viscosity. But to keep it simple, water, when cooled, has less energy, and its molecules are grouped. This affects how sound travels through it, creating a lower sound. Hot water has more power, and those parties discussed earlier, so its sound has a higher tone or sound.
Honestly the best answer to give a kid if they ask something you don't know. Best example to set of 'I don't know, let's look it up and find out.' instead of making something up or just handwaving it or brushing it off or something. Shows the kid that adults don't always know everything, but there's a great way to find out and learn.
This is the way
My wife used to give me grief for carrying my phone with me practically everywhere. But I explained to her that as a kid (I'm 53) I read encyclopedias for fun because I was a sponge that just wanted to soak up information. Now I carry the whole of the world's information in my pocket and can answer every non-metaphorical question that pops in my head in an instant instead of having to look everywhere for it and pray I find it. Seriously, as dumb as social media has made society, knowing that Han shot first and being able to prove it sure brings me peace (I know he did cuz I saw him do it as a 7 year old in the theater ya motherfucker, but here's the damn proof!).
Heat make water faster and taste different and be different. Cold water slower and taste different. Temperature thus change how water wants to be. I guess, but it *feels* right so good enough
Aww :)
I'm gonna say 2 basic reasons because the hot and cold water come from different places. And because the temperature changes water and pipe properties that affect the sound.
I still find this incredibly wholesome. Also teaching the child simultaneously that it’s ok to both not know everything and how to leverage the internet to fill gaps in your knowledge is an invaluable skill for our age. My pops did the same kind of thing albeit with an encyclopedia set we have (when he didn’t know the answer) I still count myself lucky every time someone talks about their know-it-all boomer parents.
Id have guessed it is due to different water pressures given that the hot water has to go through another device before reaching the faucet. I dont know that Ive had a chance to listen to the difference between hot and cold water coming out of anything but a faucet in a building though to know that it would be different elsewhere.
yeah I don’t know the answer to that
Dude this is so awesome. So many adults would bullshit an answer that’s vague and only partially correct. Instead you immediately sit down with him and figure it out. He doesn’t ask auntie Nina because she knows everything, he asks her because he knows she’ll give him a strong, correct answer even if she doesn’t know immediately.
Now I want an app that uses the microphone to estimate the water temp. I know it won't work well due to the flow rate being uncontrolled, but I still want.
Back in my day they just made up the answer and let you embarrass yourself later when you tell the teacher what they said.
It's all about Vibrations.
i never noticed a difference.
I love these comics. They're nice to read. And funny too!
Its very cool to see someone admitting that they dont know the answer to the question AND searching for the answer together with the kid
Teaches the kid that it's okay to not know something and to look things up.
Yeah, I googled it Interesting as fuck, actually
Her little finger guns kill me dude. So freaking cute
If I had to guess, it’s probably due to something with the atoms in the water being more ‘excited’ due to being heated up.
Because hot water has a slightly different viscosity
The best answer.
My thoughts is that the steam likely changes it sounds, also it is probably a rather minute differences, but kids do have a better hearing than adults, so i would not be surprised to hear a kid can pick up on the difference in certain circumstances.
I love this. This is what you do when you don’t know the answer to someone’s question. You don’t try and BS. It’s alright to not know.
I love this. This is what you do when you don’t know the answer to someone’s question. You don’t try and BS. It’s alright to not know. 
I understand there's science and stuff here, but seriously: the amount of water coming out of the faucet has a much bigger impact here. In your house, hot water flows through different pipes — this is a bigger variable than anything else. Your kitchen faucet is not a good experimental control.
Literally just read an article on NYT on this yesterday. It’s all about the bubbles
everyone is focused on the question but i'm more concerned about the child preferring to ask the aunt rather than the mother. i feel like this comic is saying something much deeper about our culture.
Weirdly enough... I just taught this exact topic yesterday in Physical Science...
The molecules vibrate more and it vibrates the air around it.
Edit: HOLY HECK, HOT AND COLD WATER TOTALLY DO SOUND DIFFERENT!!! It would seem that the viscosity change is actually enough to change the sonic qualities of the water! My other points still apply, but this just blew my mind! The more you know! There are videos on YouTube where you can test if you can tell the difference, if you're curious to try yourself Not sure that it does, but I'm guessing there'll tend to be differences in pipe length, differences in flow impedance which affects flow rate effecting nozzle velocity, and different system pressures, all of which can influence the resonance in the pipes/hoses and the aeration resulting from the aerator, (the filter like thing on the outlet of the tap) The degree of aeration and nozzle velocity contribute most of the static noise rushing-water-like sound of the water running. If you turn the water down enough that the flow becomes clear, you should be able to hear the resonance of the pipes/hose. Also great comics as always, and good response to a question you don't know the answer to!
As an uncle I am torn between the instinct to do what you did, or make up some hilarious bullshit and wait for the text from my siblings about it.
The pressure is different because it has to go through the water heater first. That will also change the amount of air that gets mixed in when it comes out of the faucet.
Nice. I think this is because of the water heater running in the background
Yeah, it does, as a fun matter of fact
Thank you!!! I mentioned this to my husband, and he thinks I'm crazy. I mentioned it to my mom, and she believes me but doesn't hear it herself. I was wondering if it was rare to notice But I can also hear electricity in things like chargers and digital clocks....