TOPIC:

ID Code: I3-15
Purpose: 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.
Availability: Available