Why is the process of evaporation occurs only at the surface? - Vidyadip

Question

Why is the process of evaporation occurs only at the surface?

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Answer

Evaporation occurs only at the surface of the liquid. This is because in a liquid, the molecules are in constant random motion. The speed of these molecules keep changing due to their collisions with other molecules. If molecules near the surface of the liquid gain sufficient energy, they escape and become vapour.

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