why the vaccum ball cannot be seprated
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The two balls stick to each other because the air inside them is pumped out with a remarkable force between them so that they can stick together.
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The Magdeburg hemispheres are a pair of large copper hemispheres, with mating rims. They were used to demonstrate the power of atmospheric pressure. When the rims were sealed with grease and the air was pumped out, the sphere contained a vacuum and could not be pulled apart by teams of horses.
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