what causes this phenomenon
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Answer:
vaccum pump
Explanation:
in 17 th century Otto von guericke invented this
with the help of this vacuum pump he demonstrated that dramatically the force of the air pressure is joint to hollow metallic hemisphere of 51 CM diameter each and air-conditioning from the space between them by using the vacuum pump employed to teams of 8 forces each pulling in opposite direction to pull them apart the four software process was so great that the two hemester could not separated
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Answer:
atmospheric pressure causes this phenomenon
Explanation:
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