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A large force is needed to separate normally two glass plates having a thin layer of water between them. Why?

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A large force is needed to separate normally two glass plates having a thin layer of water between them. Why?

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The thin layer of water between the glass plates forms a concave surface all around. This decreases the pressure on the inner side of the liquid film. Thus, a large amount of force is required to pull them apart against the atmospheric pressure.

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