Sound in a Vacuum Chamber

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In today's video we're using a bluetooth speaker and a portable recorder to find out how sound works in our vacuum chamber!
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Music by: Marc Torch - "The Speed of Light" (Instrumental) Royalty Free Music from Epidemic Sound:
This video is only for entertainment purposes. If you rely on the information portrayed in this video, you assume the responsibility for the results. Have fun, but always think ahead, and remember that every project you try is at YOUR OWN RISK.
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Hey guys i'm nate welcome back to a. workshop today we've got a fun . experiment where we're going to see what. happens if we put a microphone and a . speaker in our vacuum chamber as many of . you probably know sound waves are . vibrations in the air around us and so . in theory if we take away that air those . sound waves should no longer propagate . and we shouldn't be able to hear . anything we want to try putting that to . the test in a few different ways as a . first test let's try putting our speaker . into the chamber but leaving all of the . air in and see how much of the sound our . microphone can pick up right outside the . glass wow that's a huge difference right . there well i guess we know that glass . and thick plexiglas does a good job of . dampening sound all on its own all right . i think we've pretty well established . what its gonna sound like with our . speaker in air inside the vacuum chamber . so now we need to try pulling out the . air but i also want to make sure that we . aren't just blasting too much sound . straight into the glass because that can . also conduct the noise so to add a . little bit of padding let's throw some . cotton balls down into the bottom of our . chamber and make sure that our speaker . is facing the correct direction this . speaker actually blasts the sound out of . the back. so we'll try putting it face down on top . of a pile of cotton balls to make sure . that we're really playing into a vacuum . as much as possible that seems like a . good amount of cotton balls it should . keep our speaker off of the glass so the . sound is just projecting into the air or . the lack of air once we pull a vacuum . now let's try pulling out a vacuum hope . that our bluetooth speaker still works . in a vacuum and see if we can hear it . all right air is being pulled out . i admit i hadn't actually tried seeing . what happens with cotton balls in a . vacuum before just now i don't think . it's gonna do anything and it looks like . i'm right they aren't puffing up the way . marshmallows do because they aren't. holding any air . there's just air in between the fibers . this is looking good almost up to a . vacuum we have very little air in there . right now at about 25 on this pump the . most vacuum it pulls is about 26 inches . of mercury all right that is really . close we're gonna try calling that good . let's see how well we can hear our . speaker or not. with a vacuum here goes playing the same . clip of music oh if i touch my ear . to it then i can hear a little tiny bit . it's extremely quiet and i can't hear . anything if it's on the glass it's only. on the plexiglas side where the speaker . is actually pointed right at it so there . may be a tiny tiny bit of air still in . there or maybe it's conducting directly . through the speaker into the cotton. balls into the glass through the rubber . to the plexiglass i don't know i'm not . sure how it's getting there but like . this i can barely hear the faintest . music other than that see i'm gonna try . it like pushing it touching this . microphone to the plexiglass i don't . know if it'll pick anything up so quiet . all right let's let the air back in . while it's still playing and we'll see . what happens. letting it in slowly so we can kind of . see at what point we can hear it. i'm hearing a little bit of it now . [music]. all right that seems like a pretty good . conclusive test to me that this does not . play well through a vacuum there was . just the tiniest bit of sound that was . able to get through somehow maybe . there's just a little bit of air in . there maybe was conducting through the. other materials inside the chamber but. it was almost completely silent so now . let's try switching put the microphone . inside the speaker outside and see if . the microphone can pick anything up all . right let's pull all the air out and . then we'll turn on the sound and see if . the microphone can pick anything up all . right let's call that good microphone is . still recording we'll see if it can pick . up any of the sound here goes . [music]. all right now also as an experiment . let's try touching the speaker to the . glass and the plexiglass and see if it . picks anything up like that all right . let's let the pressure back in and we'll . find out how it went . i'll try letting some music play while . it depressurizes to see at what point . the microphone starts picking things . back up. [music]. [music]. there we go microphone in the vacuum. chamber with the speaker outside the . vacuum chamber now i want to try putting . both of them in the vacuum chamber with . the cotton balls and then pulling the . air out and i think i might actually try . letting the sound run as the air pulls . out so we can see if it just slowly. drops off as we run out of air give a . shot speak here in here make sure it's . not touching the walls microphone in . there all right there we go . we've got both of them in there let's . get the sound going and then start . pulling out the air and see if we get . that sound to just seem like we're . turning down the volume knob . [music]. [applause]. [music]. very quietly i can hear if i touch my . ear to the plexiglas like really press . it on there think i can even hear it a . little bit with my ear on the glass . itself this time super quiet though . alright let's let the air back in while . it's still playing see what kind of . result we get . [music]. all right there we go . both the microphone and the speaker in. the vacuum chamber at the same time . pulling the vacuum while it's playing . music so hopefully we can hear the sound . diminishing as it loses the ability to . transfer the sound through the air now . i've had a chance to go and listen to . the sounds that the microphone recorded . while the microphone and the speaker . will both inside the vacuum chamber with . no air i really thought that the sound . is gonna be almost nothing that it would . be almost completely silent but the . microphone managed to pick up quite a . bit of the music from the speaker so . something in that chamber is still . vibrating enough to get the sound from . our speaker to our microphone there you . have it playing sound and music inside a . vacuum chamber we tried a whole bunch of . different varieties with the speaker or . the microphone inside the chamber . outside the chamber both inside the . chamber and i think we got some really . good results and luckily for us our . microphone does still function in a . vacuum that was good to learn this has . been a really fun experiment i love . learning and testing new things like . this thank you for joining us for this . video today and remember to come gear . yourself up with products and merch at . the king of random calm see you there . hey guys i'm nate what man a little . worried about the lcd screen so far it . seems alright . sorry i'm super white . .

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Category: Education

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