When evacuated, held together by bombardment of atmospheric molecules.
What it shows:
Two brass hemispheres are brought together and evacuated, and are held together by the pressure of the atmosphere.
How it works:
Two brass hemispheres fit together to form an air-tight seal. One has a vacuum pump attachment and stop cock; the completed sphere can evacuated using a vacuum pump under a minute. As atmospheric pressure is 105Nm-2, the 11cm diameter hemispheres are held together by a force of 15000N. Invite members of your...
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