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  4. If a glass rod is dipped in mercury and withdrawn out, the mercury does not wet the rod because

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Q. If a glass rod is dipped in mercury and withdrawn out, the mercury does not wet the rod because

ManipalManipal 2011Mechanical Properties of Fluids

Solution:

Cohesive force is the intermolecular attraction between like molecules, whereas adhesive force is the intermolecular force between unlike molecules. In the given case cohesive force between mercury molecules is more than adhesive force between mercury molecules and glass rod, hence mercury does not stick to rod.