Shaving Cream Under Vacuum

YouTube Description:

Shaving Cream will expand dramatically when put in a vacuum. The outside pressure around the foam becomes lower than the internal pressure of the air pockets, making them expand.Found@ http://www.wfu.edu/physics/demolabs/demos/2/2b/2B3230.htmlCopyright: http://www.wfu.edu
Sagemindsays...

Not at all what I expected. I figured it would implode and shrink as all the air is pumped out.
Is the foam retaining, and locking in the air? Is the foam stronger than the applied vacuum?

If the air is truly being pumped out, why would the foam bubbles not be popping and breaking down?

Boise_Libsays...

>> ^Sagemind:

Not at all what I expected. I figured it would implode and shrink as all the air is pumped out.
Is the foam retaining, and locking in the air? Is the foam stronger than the applied vacuum?
If the air is truly being pumped out, why would the foam bubbles not be popping and breaking down?


If the foam were introduced into a hard vacuum quickly it would breakdown. Since the air is slowly being pumped out of the bell jar the bubbles in the foam expand slowly. If the pump was faster, or the video was longer, you'd see the foam will breakdown as more air is removed. Eventually you'd end up with a hard vacuum as the liquid boiled off.

gharksays...

>> ^offsetSammy:

This could be marketed to extremely hairy people as a cost cutting measure.


And the Scotch, don't forget they like to save a penny, the only trouble is you'd have to sell them the device.

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