PURPOSE: To demonstrate forces arising from atmospheric air pressure.
DESCRIPTION: About 40 pumps will adequately evacuate the hemispheres, and the vacuum will last about one minute. The hemispheres have a diameter of about 5 inches, thus requiring a force of over 250 pounds to separate them when fully evacuated. A safety restraint prevents the two hemispheres from separating entirely.
SUGGESTIONS:
EQUIPMENT: Magdeburg hemispheres with hand pump and hose.
SETUP TIME: 5 Min.
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