Question

why evaporation is called surface phenomenon

Answer 1

Evaporation takes place at surface and below  the boiling point. The surface atoms or molecules gains energy from surroundings and overcome the attractions of other molecules & get to vapourise
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Answer 2

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${\mathcal{\huge{\bold{ANSWER:-}}}}$

Because the molecules of water present on the surface of liquid are bonded weakly as compared to inner molecule and when temperature increase hydrogen bonding between water molecules break. Due to this,
Water molecules tend to evaporate.

$\huge \bold {That's \: Why}$ it is called surface phenomenon.

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