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Destroying a Soda Can with a Ping Pong Ball! - YouTube
Channel: Adam Savage鈥檚 Tested
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everybody its norm from Tested and Kishore from tested and Kishore we are
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thrilled so present with you new series
demonstrating some great things with
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science
yeah there's amazing demonstrations that
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you can do that showcase all of the
fundamental principles of chemistry
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physics biology they're all well within
reach you remember those demos that you
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used to see in high school yeah it's
like magic it's nice to come in make
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something explode basically Heisenberg
from Breaking Bad so we're hoping to
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show some of those for you over the
course of this series and a little bit
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of behind the process to put these
together because they're oftentimes
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really simple endeavors with really
wonderful outputs
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well we're privileged to have with us
Zeek cos over from the Exploratorium
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which is a great institution in San
Francisco first science museums it's one
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of the preeminent science museums in all
of the world and it's a museum of
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science art and human perception they
maintained a library of all of these
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science activities that you can do at
home with your kids and at the same time
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they train a whole host of teachers on
how to do and teach better science in
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the classroom walls you're going to chat
with Zeek and please enjoy this simple
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feat of science
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welcome Zeke Zeke is a teacher at the
Exploratorium which is a Museum of
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science art and human perception and
you've brought something for us to
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experiment with today what are we
looking at here so this is a vacuum
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cannon cannon yeah that's okay the the
origin of the vacuum cannon was that I
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was a high school teacher for many years
and the school wouldn't buy me a pool
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table for my classroom I was taught
physics and there's all sorts of cool
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physics that you can do with a pool
table but they wouldn't get me one and
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when I asked them why they wouldn't get
me one it wasn't that it was too
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expensive or anything they said they
were afraid that the kids would throw
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the pool balls at each other or hate
each other with the pool cubes and I'm
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like what and there is a note you can't
have one and then a couple of years
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later they bought the kids a ping-pong
table because ping pong tables are safe
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because the ponds are safe right you can
throw you can throw a ping pong ball at
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someone pretty much as hard as you'd
like and it won't hurt them like even if
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you like give it the biggest slam you
got it won't hurt him buy and the reason
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is is that the ping pong ball for its
size has a lot of air resistance they're
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about two and a half grams and they're
fairly large for two and a half grams so
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the wind resistance slows them down
super fast so like even if you were like
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hit it at sixty miles an hour by the
time I gets the other side of the table
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it's only gone in like ten miles an hour
so it slows down so much that you can't
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hurt anyone with it and so that's why
they got them at ping pong - so is there
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a way to speed up a ping pong well so
the if the problem with a ping pong ball
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is that the air resistance slows it down
so much then the solution is getting rid
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of the air and that's why this is a
vacuum cannon so what we have here is a
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vacuum pump and I'm going to draw the
air out of the tube and this is just a
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PVC tube yeah this is a clear PVC let me
set it up so we can put the ping-pong
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ball into the tube like this roll it to
the end and then we'll seal up the
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ping-pong ball with some mylar this is
the
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stuff they used for emergency blankets
don't tell anyone at the Exploratorium
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that I stole their make you think they
might learn about this somehow oh this
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isn't going out to anyone I'm sure and
then we need a target and we'll use this
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can and then I can seal up this other
side down here as well and how tight of
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a fit is the ball in this too
so what's really lucky is that this tube
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is about 41 millimeters on the inside
and the ping pong ball is 40 millimeters
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so it's a very tight fit on the inside
of the tube so that it just barely fits
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down the tube anymore it would get stuck
any less and then wouldn't make it as
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tight a fit so you said the word cannon
which to me imparts lots of energy is
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gonna hit that yeah can so what's gonna
happen is I'm going to take the air out
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of the tube and then I'm gonna puncture
the end of the tube and air is gonna
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rush in so air pressure is about 14 and
a half pounds per square inch and the
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tube is about three square inches on the
inside so about forty-five pounds of
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force is gonna push on two and a half
grams of ping pong ball you're mixing
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weights but we took that it's okay yeah
and so it's gonna push on the ping pong
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ball and the ball is gonna get shoved
forward now normally if you try to push
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a ping pong ball really hard it can't go
very fast because of air resistance but
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there's no air or very little air on the
front side of the ping pong ball so it
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can be pushed incredibly hard and you
can fly down to the end of the tube and
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if everything goes according to plan it
can be going 500 miles an hour by the
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time it gets to the end 500 miles an
hour that's like speed of sound level
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yeah we're getting close to the speed of
sound well I'm gonna get out of the way
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because speed of sound sounds really
fast and I'm really close to the cocaine
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yeah no and let you run the experiment
yeah so it's it's very loud so I'm going
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to put on some earmuffs
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and it takes about 30 seconds for it to
pump completely down so now we're
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pumping it down pulling me out and then
I'm gonna close this valve so that when
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the air rushes in it doesn't go into the
vacuum pump all right let's count this
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down three two one
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whoa so here's our friendly ping-pong
ball that's now been cleaved in half mmm
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they don't make them like they used to
but more importantly let's take a peek
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outside can this wonderful hole is now
dramatically in the can so this hit it
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with with 500 miles an hour coming out
of this thing right and it's so there's
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basically a perfect vacuum and all that
hits it does any air ever get around the
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ball that's right so a little bit gets
in front so the air is it's rushing down
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a little bit the air can get past the
ping-pong ball so there's a limit to how
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long you can make the tube because as
the air is getting in front of the
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ping-pong ball then the ping-pong balls
can be slowed down by that air in front
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of it and then what the ends use this
mylar which you use a heating blanket
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I've seen it done other times with
packing tape can you do that so packing
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tape works pretty well but you need to
get the extra wide time which is a
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little hardest to come by and every so
often the the the material gets sucked
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down the tube because he didn't hold it
well enough at the end and if that
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happens to packing tape it is a bear to
get that out because it sticks to the
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inside where it's the mylar you need to
blow it on the end you'll blow the mylar
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back out oh this is fantastic I see you
have a blast shield up but how important
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is the blast shield to for safety I mean
I I mean it looked like shards of this
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was coming off so we're important to
have yeah you need the you need some
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sort of a shield you can get pieces of
polycarbonate that's a hardware store
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they're very sturdy you just need to
make sure
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clamp them down into place so here is a
simple half-day project to almost break
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the speed of sound so to prove all those
people wrong that ping Kong's can't be
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harmful exactly
thanks so much the four people that want
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more information about you and the
Exploratorium where should they go they
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can go to WWE explore Toria media or
they can come down and visit us at Pier
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15 and the Embarcadero in San Francisco
and the Exploratorium has a number of
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different activities online that you can
do at home this is just a taste
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thanks so much see thank you very much
orcish or destroying soda cans with ping
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pong balls it's amazing the power that
even something like a ping-pong ball can
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have when you remove air resistance to
it I couldn't believe that it could get
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up near the speed of sound right the
sound is something you associate with
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jet aircraft and it's something that you
know you need to crating with a vacuum
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its atmosphere or taking as much
atmosphere pushing it through that tube
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smashing through you know what else was
surprising about it is the materials
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that went into this project we're
talking about PVC pipe talking about a
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little bit of of putty and some plumbing
fittings it's not super complicated
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materials that went into it
demonstrate one of the fundamental
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principles in all of physics air
resistance and I'm still blown away that
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I guess you can really do some damage
with a ping-pong ball awesome well we'll
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be back with more simple feats of
science with Kishore and Zeke so please
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subscribe to our youtube channel like
this video and leave your comments below
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and we'll see you next time
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you
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