Snowman Vacuum Experiment

In this festive video, Paul Cook will demonstrate pressure in a flask with a lovely willing volunteer, a marshmallow snowman!

Video transcript below:

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Hello, I’m Paul Cook and in
this Christmas special edition

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LaBLiFe video, we’re going to
look at pressure in a flask.

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So you can see here that I’ve
got my flask. It’s a Borosil glass.

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Very thick. And attached to
this side arm I’ve got some

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hose. And inside the flask you
might be able to see that I’ve

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got a very willing volunteer.
It’s a marshmallow snowman.

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It’s also got a hand pump. And
in this flask at the moment

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we’ve got normal atmospheric
pressure. I’m going to attach

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the tube from the hand pump that’s
connected to the flask and I’m

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also going to now put in a bung
sealing that flask and now if I

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pump so I’m extracting the air
and we’re creating a vacuum.

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And as the pressure decreases
inside the flask you should be

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able to see our volunteer, our
snowman become larger and

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larger.

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Keep pumping. They’re getting
bigger and bigger.

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And see.

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You can see it getting bigger
okay so now if I release the

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pressure

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you can see that as the
pressure in size increases our

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snowman reverts to its normal
size. Merry Christmas.

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