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Can You Hear Temperature?
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- Опубліковано 23 жов 2022
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In this video I do some experiments to see if you can tell the temperature of things by the sound they make. I also show you why your voice gets higher when you inhale helium.
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first
First
I-i mean second!!
Hello
Ok
You can definately hear temperature: If it's cold outside, I always hear my mom complaining about it.
so true
Here at 17 likes
Here at 33 likes
For tropical country, it how it sound when it's hot outside.
😂 💀
At 4:42 I meant to say the “less dense” a gas is the faster sound moves, not “the more dense”
Ok!
You should pin this correction!
You should pin this comment!
You should pin thin comment!
I think you were right in the video. Sound travels faster in dense gas, but not as far,
A few years ago I attended a lecture by a member of the Primary Thermometry team at the UK's National Physical Laboratory. He was explaining their work on creating an acoustic thermometer which measures temperature through the speed of sound in a gas and is so accurate that it has been used to help measure the Boltzmann constant to greater precision than ever before. It is also being used to check the accuracy of the International Temperature Scale.
@Cannabis classifieds legal where did he lie
Must be a slow thermometer, that measured gas would have to remain in a sealed chamber separate from the air (because air is not constant or uniform)
@@greyskullmcbeef4901 I believe its primary purpose is to calibrate other more practical thermometers. It looked like a small pressure cooker and the thing to be measured had to be sealed inside and allowed to reach thermal equilibrium. From memory the gas used was super pure argon.
@Cannabis classifieds legal 😭😭
My theory would have been that the steel shrinking also changes the geometry of the fork, thereby changing its natural frequency - sweet video!
I just said that, too. :D
Probably a smaller effect but yeah. The stiffness change is probably the main reason behind the change
8:58 - My dad used to tell me about particularly cold winters in Central Europe during WWII and in the years just after it - temperatures reached as low as -40°C (same in °F), and one could hear trees "exploding" from freezing in the forest during the night (he lived in some village back then). "And then on one night", he said, "I've heard some people talking 'next to me' but there was no-one around! - it kinda spooked me, and I looked around, further away and saw two guys talking, but they were like well over hundred metres away from me!".
That happened to me on a river one cold night. I could not believe I could hear those guys talking on the other side.
“Never tell a secret on a cold day” - (forgot who said it)
@@theexplainer1576 lol ive heard that
I remember in marching band we always had to tune to the vibrophone when it was cold because it would be sharp compared to a wind instrument who would be flat.
Finally! An explanation of *why* helium's faster speed of sound changes pitch! Changes of resonance! Bravo!!
If you are a blacksmith, you can totally hear temperature
See and hear*
A caution to any visitors to The Action Lab: Do not drink from the insulated thermos, it does not contain coffee.
lol
Hell it doesnt! Ill take a sip right n
It contains forbidden iced coffee
3:47 is when sponsor ad ends. I hope they paid you really good for this one, because that's one of those horrible games that everybody sees fake mini game ads for and nobody actually wants to play!
Growing up in Minnesota, I can tell you that commercial jets flying high above sound higher pitched in the dead of winter than in summer. Like adjusting the tone knob to treble in winter and to bass in summer. As far as actual temperatues, I'm talking -10F to 90F(-23c to 32c). I don't know what combination of effects causes that, but I notice it every year.
That is because different frequencies are attenuated differently by distance. Higher frequencies die off faster and so doesn't travel as far as lower frequencies. The seasonal changes in temperature and therefore speed of sound in turn moves the cut-off frequency of what reaches your ear before the volume is below audible levels. As a plane gets further away the noise it makes drops in pitch for the same reason (frequency-dependant attenuation). We use this to gage how far away a concert, a car with the stereo blaring or any other sound that is familiar to us is.
On the biology side of things animals who communicate over large distances do so with lower frequencies as they carry further. Think elephants who rumble at so low notes humans can't hear them, in order to call on group members kilometres away. And the territorial growl of lions which are low pitched to both convey the message further and simultaneously broadcast size as the size of voicebox needed to amplify the sound increase with lower frequencies (higher wavelength of resonant modes)
It's really great how you covered so many effects in such a short video. All very clearly explained! Thanks!
8:09 That Helium stuff is magic - it makes you look younger as well as talk like Chip 'n' Dale! lol
Super interesting. That water pour blew my mind.
Our hot water from the tap takes a long time to warm up. If I wasn't concerned about wasting it I can tell when it's warmed up just by the sound of it hitting the metal sink.
2:00 I think I can guess why, it's how the molecules do much less moving so the sound waves are shorter since it's rushing back to it's original position much faster, the hotter one, with much more movement leniency won't be so strictly held in place making it able to wiggle and move further creating larger waves.
If you consume the right substance you can even taste colors and see sounds.
you can also tell the temperature using the rate at which crickets chirp. It is called Dolbear's law.
I was gonna say that for all 3, it won't matter because I can feel my eardrums and thus I can 'hear' most differences in temperature but the explanations you gave were 10/10. Then that 5 picometer nugget at the end iced the cake.
I'm 43, it's not often science really surprises me any more, but our eardrums being sensitive up to 5 picometres blew me away. 1/24th the size of a hydrogen atom? Bloody hell, we must have quantum ears.
In many instanes in my life, my eyes have told me that a gauge was out of spec or something required an adjustment, and upon investigation, my eye was always right. It is amazing we can easily see non-vertical angles to less than a degree, although our head and eyes constantly moves and so on...
@@nameredacted1242 If it looks right, it often is. Amazing we're so blessed and with what further training can achieve.
Thank you for explaining how our voices might _appear_ to be higher with a lighter gas, but it's only a higher _timbre,_ due to harmonic emphasis, and the pitch stays the same. Veritasium got this dead wrong in a whole-ass lecture a few years ago, and I've barely forgiven Derek for it. Like people mistaking dwarfs' voices as higher-pitched, when-no, they just have a smaller cavity in which their vocal cords vibrate. I've simulated many "children's choir" parts for tv shows _as a natural baritone,_ and while one does need to pitch them up a bit (smaller vocal cords) it's no more than two hundred cents or so, and it's all about the pitch/formant balance to achieve a convincing effect. Anyone who's even played around with a professional pitch modulator plugin in the last 20 years knows this, which is what was so frustrating about Derek's lecture.
Yes, you can. As the weather cools, you can hear far more sounds outside. Just listen to cars. You can hear them much farther away in cold weather.
this was an interesting video for sure but the one thing i'm wondering is if humidity effects the sound travelling through air at all...
You rarely cease to amaze me, by dissecting the things I (we) take for granted and demonstrating the miraculously fine tuning our senses, and perceptions, have evolved for us.
And demonstrating how numb we have let our brains become by hating each other for irrelevant reasons, like skin color or political leanings.
Thank you.
You always come out with the coolest experiments, thank you for that🙏
Haha! Pun intended? 😅👍
Nothing better than a good old Action Lab video
so sad that they cancelled the sound waves. twitter crazy bro.
This is an interesting concept. Maybe they should create a table for that tuning fork and what it resonates at for each degree. We can deduce a function from regression analysis! Then do the same for the others!
In orchestra we use the tuning forks to get our pitches for the timpani. You can even use them during the performance. They are too quite for the audience to hear. But if you hold the end right up to your ear (maybe even a little bit inside your ear), the tone is quite loud and can be heard over the orchestra.
Touching it to one's teeth works even better. Of course one does not share tuning forks in this case. Or do it on camera. (-:
@@JdeBP Oh wow! Never thought to do it like that. 👍
You can also make a tuning fork ‘louder’ by sticking your finger in your ear, then putting the button of the tuning fork on your elbow! The sound is conducted into your ear through your bones
Slowly starting to sound like vsauce titles
I suppose technically, we cannot hear temperature (since it's measured in degrees Celsius, not decibels or hertz), but we can hear the effects of differences in temperature.
I can always tell the approximate outdoor temperature when I wake up. The quality of sounds - distant cars on the freeway, nearby cars, dogs barking, people talking - are different at different temperatures.
Yes, I know it's too hot when I hear Billy across the way cursing at the sun.
lol
I noticed going to outdoor festivals that higher frequencies tends to go away with the wind while the low frequencies are not that affected.
When it’s 30°F outside, I can hear an ambient sound similar to “haaaaaaaa” like a soft whisper. Especially in the morning.
I remember on the periodic videos, Professor Poliakof had placed a tiny radio in a chamber with helium and the music was high pitched! Then he used hydrogen and it played even higher! So is it the certain frequency of the fork, which allows no difference? Also I’d like to see what propagation happens when SF6 is used!!☢️☢️☢️
when its gets real cold you can hear stuff from so far away that its rather easy to tell if you notice things like that.
Well when you were tapping the fork in helium, my dog really wondered what you were up to.
Not just that, but ambient noises tend to be louder or quieter depending on the temperature...and so our brain associates those two things together. Even though this may not be technically hearing temperature, it's something the human brain can do in multiple different scenarios...so it kinda works like hearing temperature.
You'll encounter the same sort of effect listening to the running water in your home. When the water in your pipes transitions from cold to hot or vice versa you will hear a difference in the sound.
If you know what to listen for, a voice doesn't sound higher when someone breathes helium, since the fundamental frequency, as you said, is the same. It will sound more like someone with a low voice and smaller resonating chambers in their head, causing higher overtones to resonate: the classic example is Popeye. Helium makes you sound like Popeye.
The opposite is someone with a high voice and larger resonating chambers, causing lower overtones to resonate: the classic example is Julia Child.
If you make a Schumann resonance receiver circuit and connect it to a sound card, you can hear the temperature in Africa from North America. The way it works is that lightning strikes excite an electromagnetic resonance frequency in the space between the Earth and the ionosphere, which is detectable around the world. Africa has plenty of lightning storms on a given day, and the number of lightning strikes correlates strongly with temperature.
Vocal cords acoustically loaded like a loudspeaker. In other words, the “spring” in the spring mass oscillator that is your vocal includes the air flowing through it. So the vocal cords actually resonate at higher frequencies in helium. You sound weird and not just higher pitched because there is still air ( and other stuff ) throughout our nasal cavities, and so there is a mismatch between the excitation frequency and the resonances in your head.
Higher density means faster propagation. At the same temps and everything else equal, speed of sound in
Air 343 m/s
Water 1481 m/s
Iron 5120 m/s
Higher temp increases movement and propagation, just like higher elasticity in a medium type.
I love how this man used square root signs for checkmarks. Absolutely brilliant.
Of course, you know it’s hot when there’s a guitar riff followed by an eagle screech.
I feel like any string instrumentalist would be able to answer this regardless. We all know the pain of having to constantly tune during the winter because your instrument gets out of tune quickly thanks to the heat generated by friction.
Since helium is lighter than air, not sure you needed the lower half of your enclosure. With an open bottom you would have better access to strike the tuning fork. However the inverse would be true is using SF6 gas as this gas is denser than air. Would have been nice to have seen this in your video. All in all thanks for sharing.
0:55 that one mosquito when you’re tryna sleep be like:
Yes you can when it's really cold the wind can be heard howling and the snow blowing and when it's hot you can hear the chicadas.
So if the proverbial tree in the forest falls and no ones around to hear it, does it matter what the temperature is for it to make a sound? (obligatory lol).
As always thank you ❤️
..for trying to teach us something new everytime.
I read that some components in smartphones can fail in the presence of helium. Something about helium being permeable through some barriers normally impermeable to gasses. Might be MEMS oscillator components or something. Helium doesn’t react, of course, but the density change throws off the device enough for it to fall outside its parameters.
We can 'hear' temperature, largely because of air pressure that's affected by temperature, the hotter the air gets, the more it wants to expand, and that's technically also why the jet engine's afterburner and rockets are incredibly loud.
There is a surprising dearth of literature, when it coms to the Young's modulus or elastic modulus of solids vs. their temperature.
I recommend this channel to help raise your mind.
People are always confused by the helium voice effect. It doesn't change the pitch at all. I think when we say the voice sounds 'higher', we'd be better to say it sounds 'squeakier'. In the same way that different instruments sound different even when they are playing the same note, or even how we can make our voices sound squeaky by changing the shape of the mouth and throat. This is all about changing the resonance and the harmonics. Pavarotti's top C sounds very different to Mika's top C, and that's because the resonance is different and there are different harmonics. Helium changes the timbre and quality by changing the way the air in your mouth, nose and throat is able to resonate. I know he sort of says this in the video, but he still says it sounds higher. It doesn't to me - just tinnier or squeakier.
You're right, this IS amazing to think about! You're getting into some serious forensics now! I wouldn't at all put it past some experienced forensic scientists to solve some pretty high-profile crime cases if they involved this sort of evidence.
When I get up in the morning, the tap water is cold for a while because the bathroom is several meters from the combi boiler. I turn the hot tap on about half way and after a short time the sound changes and I know it’s time to turn the tap on fully to fill the basin. If I turn the tap on fully to begin with then it takes longer to reach full temperature.
Also, I can sense a 1°C change in the room temperature.
The first one sounded more bubbly to me. That’s why I chose it. Second one sounded slow and viscous.
They both sounded hot to me, although they sounded different. I do have the impression I can tell the difference between hot and cold water pouring. I wonder if it has something to do with the microphone setup.
Could have been the method of pouring since there isn't really a controlled way to do it, and if there was then perhaps the difference would be less noticeable if at all. To me it sounds more like a science rumor than a science fact.
@@ReaperEOD Cold water is more dense and kinda slaps into the container and then stays...hot water is thinner and pours into the container more smoothly and swishes kinda...idk but I can tell the difference.
@@ReaperEOD From the video it sounded like someone did some sort of study. Assuming that's true and it was conducted properly then it's a science fact. I have no trouble believing it because I feel like I can hear the difference just like I'd have no trouble believing if someone said there was a study that said people could tell by the sound whether there were snow on the ground or not.
In this video, though, I couldn't tell which water was hot and which was cold.
I never knew that cold and warm water sounds different, but after he poured the hot water i instantly knew it was the hot one. Never thought of even that this is possible.
You can stick two resonators of different frequencies into one box and, depending on the atmosphere inside the box, either one sound or the other will sound louder
This video is a mind changer! The Action Lab never disappoints!
It also contracts. Making it a slightly different size. On a molecular level anyway.
I always wanted to know why the sound of running water changes as the water heats up
3:45 I guess that's the most random advert on a "scientific" channel, I ever saw. 🤣
I can smell it when it's cold outside, It's definitely different when it's below freezing
when running water through the faucet, when the water finally gets hot i can hear the change in sound the water makes.
I think sound in the air in different climates sounds unique. The desert sounds different than tropical climates. That could be air density just due to temperature or partly from humidity.
Off course you can hear heat ..I hear the oven ticking every time we use it lol 😆 😂
A whip supposedly can break the speed of sound due to conservation of energy. As mass decreases along it's length velocity increases. So does this mean that if you replace the handle with a hammer(more mass) you can swing it slower and still break the speed of sound at the tip? Or rephrased, if you swing it the same velocity the tip will be moving faster if your handle has more mass?
thats dope that he was wearing a byu shirt in his spinning tube demonstration
"We will be seeing if we can hear the temperature" haha
@ 2:00 you almost grabbed the cryogenic fork. lol
vocal timbre, baby
For all my life people have told me that this was not real. Now I can prove to them more directly that I'm not insane. THANK YOU!
I have it were when it's hot, everything sounds more muffled. And when it's cold, everything sounds more sharp.
Is this why music is so great! (All of it)
i thought this was gonna be about what i always wondered - if tempurature is just motion, why cant we directly hear it? is it because its such small motion that it cant impart it onto the air molecules? could we get a detector that could "hear" it? is that what laser temp gauges are doing??
I have a vacuum chamber experiment suggestion, see what happens to Nacho Cheese and The White Goat Chheese that you get at the Mexican Restaurant in a vacuum chamber.
Thank, you! Exclusively useful information and good experiments!!!
_"Regular_ air" vs. helium? I was thinking that helium doesn't count as air; it's just that air and helium are both gases, with air being a "gas alloy."
I’ve always noticed sound travels further in cold weather
Wow, I wasn't expecting to see an actual Lasso d'Amore . . . .
I can hear when my shower is warm and I can get in.
I somehow think I can hear when the water is getting warm and hot from the tap. The sound is more "crisp" somehow when it's hot.
You can hear it for sure
I've also noticed you can smell things stronger and further from the source, in colder air, compared to warmer air.
Wow, I didn't know you could shave by swirling around a tube filled with Helium !
FYI: 440Hz is A4 [the A note just above middle C]. ;)
“Let’s see what happens when I put this liquid nitrogen” “now lets hit it!” ‘It just shatters’
Ok this ad really got me, probably the first time I will download something from a youtuber's ad
“It’s -190 degrees Celsius.” No protective gloves needed!
I wonder if the continuous wave of moris code would sound a bit higher in cold weather, radio waves in free space.
Try doing same , test -3 (gas). But difference is that the fork would be dipped in liquid nitrogen
Ok but you did really test the air producing sound like wind, to test this id say pass different temperatures of air through a flute and see if the pitch changes, the pitch of a wind instrument is based on the resonant frequency of the air right?
Video idea: Diffraction. it"s a lesser known phenomenon than refraction, I think it would make a interesting topic.
Tuining Fork at 444 Htz = A Natural on Piano🔊🎵
Why i started laughing when he put it so casually put it into liquid nitrogen?