Cool Science - 5/5/14: Air Pressure

By Ian Hoover- 21Alive

May 5, 2014 Updated May 5, 2014 at 10:25 AM EST

FORT WAYNE, Ind. (21Alive) -- This week's episode of Cool Science features Martin Fisher talking to you about air pressure.

Martin placed a Peep in a vacuum chamber (a flat plate, with a glass jar around it). He then connected it to a vacuum pump. When he removed the air from the chamber, the air pressure in the chamber decreased.

It reached a point where the pressure in the Peep was greater than the pressure in the chamber. This caused the Peep to swell and expand. When I let the air back into the chamber, the pressure increased as the air rushed in, pressed on the Peep, and the Peep was small again.

Click on the video to see this cool experiment.




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