Easter Bunny Meets Vacuum Pump (Demonstration)
(Reference: 1989 Weird Science/Flinn Scientific, Inc.)
 

Pressure   :  Vacuum
 

Purpose:
Demonstrates gas laws by allowing students to apply knowledge to an unexplained curiosity
 

Safety:
Safety goggles should be worn by demonstrator and students
 

Materials:
Marshmallow bunny or regular marshmallow
Vacuum flask
Aspirator
 

Procedure:
1. Place marshmallow into vacuum flask or pump
2. Tightly stopper the flask
3. Turn on water faucet
4. Observe
5. Break vacuum seal
6. Observe
 

Explanation:
The air pressure is reduced inside the flask by the vacuum so the marshmallow expands to equalize pressure inside and out, like the balloon.  As the pressure returns to normal, by releasing the vacuum, the marshmallow shrinks and looks wrinkled because its outer covering has been stretched, and also there is no more air in the air pockets inside the marshmallow.
 

Clean-up:
Throw the bunny away
 
 

Ginger Chateauneuf, 2000.
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