Question

Why evaporation is called Surface Phenomena????​

Answer 1

Answer:

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.  This is why increase in surface area is a factor of evaporation. 

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Answer 2

Answer:

Evaporation is a surface phenomenon because, during evaporation, the molecules with higher kinetic energy dissipate into the air from the topmost layer of the liquid so it is a surface phenomenon.

Ans: Yes boiling is considered as bulk phenomenon because total molecules (including interior molecules along with surface molecules) are involved during boiling of any liquid. Whereas during evaporation only surface molecules will involved, so it is considered as surface phenomenon. Boiling is a bulk phenomenon.

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