What Happens to Sound Waves in a Vacuum?

[@vincentrobinette1507]

Suspend the clock from the lid by a rubber band. That will isolate mechanically coupled noise, which should just about totally silence the clock, when the air is evacuated from the chamber.

[@GregConquest]

Yeah, this experiment was not well thought out. Also the reading on the sound meter wasn't explained clearly, we were not given a chance to hear the changing sound level of the alarm in the jar with silence outside the jar, and the initial sound level of the alarm, the supposed control, was instantly broken as soon as he closed the lid.

[@jimgreen4504]

Exactly. The sound is telegraphing through contact with the plexi.

[@dariushmilani6760]

This was an interesting topic. A British philosopher once proposed that "If in the woods a tree breaks and nobody's around, will it make a noise". You may think that, this is a none-sensical question but when thinking about it you realise that in order to hear something you need a medium and a hearing device like human ears.'👍

[@clementihammock7572]

Hence, it is the empty vessels make more sound? not a vacuum vessel. 😁

[@Corruptyoutube]

It's a trick question in order for there to be woods and a tree that breaks it must exist inside someone's mind it's a trick question because nobody being around is saying nobody is existing and if the person doesn't exist the woods don't exist and the tree doesn't exist for it to break so it can't make a sound because the tree in the woods can't exist if you remove the person. the outside of your body is the inside of your mind you create everything that exists

[@louistournas120]

You don’t need a listening device for sound to exist. It is almost as if the person who asked the question doesn’t understand the nature of reality. Sound is a form of energy. Other forms of energy are light, gravitational potential energy, magnetic potential energy, kinetic energy, heat energy, etc. Energy doesn’t disappear just because an animal doesn’t exist in its proximity. Atoms do not stop existing simply because no animal exists in its proximity. Just because I do not observe my back, doesn’t mean that my back doesn’t exist. Just because I don’t directly observe my internal organs, doesn’t mean that that they do not exist. We can hear sound, we can see our environment, we can build a mental image of our environment in our mind, but this is a copy with which we work with. It isn’t the reality. Some of these ancient greek philosphers were trying to understand nature and we can’t blame them for trying.

[@frankroper3274]

I was a sound ranger and a flash ranger in the military for a short time. You see the flash and then you hear the sound and you plot the positions on a map. I am old school so I am sure things have improved since then. Knowing the speed on light and then the speed of sound would give you an estimate of the enemy weapon. Very rough I am sure to what they have today! I love science and so I check in on Jason from time to time! He is my favorite KZbin science teacher!

[@MathAndScience]

Thank you!

[@francoislanctot2423]

Yes, please some more on similar topics.

[@helenbright3358]

I enjoyed this lecture! ❤

[@MathAndScience]

Glad you enjoyed it!

[@johntaylor8817]

Hi. Very nicely explained.👍

[@debeeriz]

put the decibel meter in the vacuum chamber too and compare, the decibels in a vacuum and in the atmosphere

[@hemrajue3434]

Sound requires media to travel. We can also make an object making noise unadioble by increasing its frequency beyond 20Khz.

[@drumtwo4seven]

Nice 👍

[@jeshuamathis9013]

Yeeeeaaaaaaaaaa. Crank up the volume in my vacuum!!! 🎉

[@Doubleolseven]

When you push the air with the palm of your hand the air touching your hand is dispersing into infinitely more massive surrounding air. If the dispersion can’t happen fast enough, the bubble of air touching your palm will compress temporarily. Can’t stay compressed in a lower pressure surrounding air so it will expand. If the compression was strong enough then the expansion will conserve the initial direction of compression thus the compression wave travelled from the air touching your palm to the air next to it. When this bubble tries to decompress, it will do it in opposite directions so the energy transferred further in one direction halves: the wave gets attenuated while it travels farther from the source.

[@Doubleolseven]

Question is how can you even push against an infinitely massive volume of air? If it was solid, you couldn’t. In a gas you can push as fast as the speed of adiabatic compression of air. If you try faster, then air will solidify in a wall of high pressure called a shockwave. This wall becomes thicker with the ever increase of speed and appears as massive as all the air behind it: you can’t compress the air anymore, you have to push around an infinitely massive volume of air that won’t want to disperse. Hence the question.

[@Doubleolseven]

How do you travel throughout air at hypersonic speed without compressing the air in front of vehicle, raising its temperature thus heating the tip of the vehicle (besides compressing it)? Whatever air compresses in the front expands in the back trail. Find a means to transport the heat from the tip of the vehicle to the back where expansion (of the air behind the vehicle) cools down. How do ufo’s travel through air without creating shockwaves? You want all answers served […]

[@pawelkowalczyk770]

So if we created much positive pressure in the vessel, could we amplify the sound...

[@LaserTurtle]

so why not put rubber underneath the clock to nullify vibration?

[@MathAndScience]

That’s a really good idea actually actually I’ll try that next time

[@alexprokhorov407]

In "atmospheric" type of conditions I would agree. However, in more general terms I will respectfully disagree with you. Here's my arguments: 1. Space (outer space) is neither hot or cold, in upper portions of the thermosphere it gets above 1500°K, or below or above that - about 20°K. With all that difference the main thing that can have a difference is radiation cooling as far as the cold goes. But in vacuum temperature is the energy of a few atoms per cubic centimeter, so they have no way to transfer that on macroscopic items, like human body. 2. Conservation of energy. Energy does not need a medium to propagate, it only needs space, however curved it may be relativity wise. So, every time I speak, yell, or sing, not only I produce sound waves in the form of kinetic energy of air molecules, but I also produce electromagnetic waves in the form of heat, which correspond in unison with the amplitude and pitch of the sound waves human ear can hear. It's even more pronounced with alarm clock, when metal produces infrared waves because of physical contact. If you have a right detector and sensitive enough in those wavelengths you can hear sounds in vacuum of space. That's how they get the sounds of planets or even stars by transposing the frequencies to audible onse.

[@Steven-v6l]

100% wrong on both arguments. Heat *is* molecular motion -- look it up. Cold is defined as the (relative) absence of heat. Outer space has very few molecules ... so there is very little heat. In fact, Outer space is VERY *VERY* cold, near absolute zero. definition:: "absolute zero" the lowest possible temperature, where all molecular motion ceases and a system reaches its minimum possible energy level. What we call "Sound" is not energy, not electromagnetic waves ... sound is pressure waves traveling through a medium -- if there is no medium, there are no pressure waves; if there are no pressure waves, there is no sound. *PERIOD*

[@alexprokhorov407]

@Steven-v6l I'm sorry, but your definitions are way off. You are confusing the cause and effect under completely different conditions Let's start with heat. Heat directly corresponds to the energy level being emitted, which all bodies in Universe do. Some of it is being transformed into kinetic energy of atoms or elementary particles depending on the wavelength and amplitude. That energy is mainly transported via photons - the carrier particles/waves. That means that any wavelengths of photons corresponds to "heat" as we sense it. Whether it's "hot" or "cold". Molecules and atoms of matter don't provide heat or cold, they just transfer their state of energy that is being influenced by the source of electromagnetic radiation, let's say the Sun, for instance. On Earth there're 3 ways that kinetic energy can be transferred: convection, conduction, and radiation. In space, in the absence of medium the only way you can transfer the energy is through radiation, and that's the least efficient way by far, between the three. The space is "cold* not because it would be physically cold if you could touch it. But because when there's absence of stars , like in the shade of a large object, it only receives energy from background radiation from the Big Bang, which wavelength corresponds to the " temperature" according to thermodynamics. Look, if you think that sound is just pressure waves of air molecules, then think of the radio. It's the same waves, that can be transmitted, they change pitch, and amplitude, and require no medium. We can't hear them, but some of them we see as visible light, or sensation tha we call ""heat" Wish you well.

[@alexprokhorov407]

@Steven-v6l here's another thing for you, unless you don't like the guy: James Clerk Maxwell (1871) James Clerk Maxwell in his 1871 Theory of Heat outlines four stipulations for the definition of heat: It is something which may be transferred from one body to another, according to the second law of thermodynamics. It is a measurable quantity, and so can be treated mathematically. It cannot be treated as a material substance, because it may be transformed into something that is not a material substance, e.g., mechanical work. Heat is one of the forms of energy.

[@louistournas120]

The part 2 is interesting but I doubt that it is measurable. It would probably require a very high amount of amplification and a fast device.

[@kricketflyd111]

So then, different gasses compress at different rates but why does a phone receive the signal while under vacuum? What gets through a vacuum?

[@Bill91190]

They can hear the sounds of stars & planets in space & space itself makes a static sound bc of all the mixed frequencies, yet we're told that's not scientifically possible. It's one or the other people. It can't be both.

[@The_RC_Guru]

I think you are confused and need to learn more on the subject. No that’s not correct. “They”? Say we can hear stars and planets (radiation likely) and yet say it’s impossible? It’s well explained.

[@John-b8d8p]

Reminds me of the meme " what do rockets push against in Space .... ?

[@GameplayUnboxed]

If one astronaut`s suit touches another astronaut`s suit, will they hear each other? Can sound propagate through their suit and contact?

[@bernhardlesche3283]

The experiment is misleading though. The mechanical pump still leaves an enourmous amount of gas in the vessel and soundwaves can perfectly well propagate in this delute aire. The observed cilencing of the bells is due to an impedace mismatch.

[@tkeen1412]

My headphones weren't working, and I didn't notice for nearly 2 minutes because I thought it was on purpose.

[@TheDigitalGuerrilla]

... So today we have this crew of space truckers, let's put them in this vacuum chamber and their reaction to this xenomorph 🤓

[@hermancm]

Take your helmet off in space and you would get frostbite very fast but also your blood would boil off and you’d die of course.

[@rudilambert1065]

Oh my god STOP TALKING once in a while!!! You shouldn't have let the phone touch the chamber.

[@executivesteps]

Kind of a crappy demo. Suspend the clock off the table, get a dial vacuum gauge to show the pressure and a better decibel app that isn’t so bouncy. Then suspend the phone off the table too. And redo the video.

[@simonramos485]

bhahaha "a little rattling"??? yeah sure buddy.., lolol ok now stick a globe earth model in that vacuum... 🤭😭😂 does it float and spin while holding water on it???

[@Fitzrovialitter]

Obviously there are no "sound waves" at all in a vacuum so we don't need to endure this nugatory video; what demographic could it possibly be aimed at?

[@g0stface23]

Why don't you make a better channel then ? Genuinely

[@Fitzrovialitter]

@g0stface23 You are such a dimwit. There is no reason whatsoever to explain why sound will not propagate in a vacuum: it's patently obvious.

[@drumtwo4seven]

Sound moves through air by compression and rarefaction of air molecules. If air is not allowed to move I'm guessing with a vacuum then it can not be compressed or rarefacted This is why you can't hear the alarm in a vacuum chamber

[@jesusjoelgarcia8115]

Hunn, I do care since humans' tragedy is only everybody's fault Just look at us 2024 elections

[@dawon7750]

That is irrelevant in these tragic days! Who cares about that?