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Mercury has a much greater force of cohesion than its adhesive force with glass. Therefore, the molecule of mercury at the edge are pulled inward by the inner molecules.But,the molecules do not move inward as there movement is opposed by the inner molecules.This causes 'tension' among the molecules near the edge.So, the molecules of mercury near the edge rearrange themselves so that no unbalanced force acting upon the molecules of mercury.In doing so, they take a spherical shape.

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