Question

7. Why evaporation is considered as a surface phenomenon ?
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Answer 1

Evaporation is a surface phenomenon because it occurs in the surface. For example when we put wet clothes for drying we spread them out so that the surface area gets increased. When the surface area increases the water will get enough space to get into vapour stage and thus evaporation happens easily.

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Answer 2

Answer:

Evaporation is called a surface phenomenon because it relies on the exchange of energy from the air molecules and the surface molecules of the liquid.

When air molecules collide with the surface molecules of the liquid, they can impart energy that the surface molecules can use to undergo the phase change.