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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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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