Why is water’s free surface concave? Mercury’s, however, is convex. [Answer Limit: 50 words] [UKPSC 2012]
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The free surface of water is concave due to strong cohesive forces between water molecules, causing surface tension that pulls the surface inward. In contrast, mercury exhibits a convex surface because of weaker cohesive forces and stronger adhesive forces with the container, leading to a bulging shape outward.