Cool Science - 3/25/13: Pressure & Vacuum Camp

By Emma Koch

March 25, 2013 Updated Nov 8, 2013 at 11:59 PM EST

FORT WAYNE, Ind. (www.incnow.tv) -- In this week's episode of Cool Science Monday, Martin Fisher from Science Central will talk about how pressure and vacuum can affect a marshmallow Easter Peep.

Easter Peeps are made of marshmallow, which is composed of tiny air-filled cells. I placed an Easter Peep into a vacuum chamber and removed the air from the chamber. As the air pressure in the chamber decreased, the air pressure in the marshmallow cells didn’t change.

However, the pressure in the cells was greater than the decreasing pressure in the chamber. This caused the air in the cells to press outward, which caused the Peep to expand. When I returned the air to the chamber, the air pressure in the chamber increased, that air pressed on the Peep, and the Peep shrank.

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