Question

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

Answer 1

Evaporation is a type of vaporization which occurs on the surface of the liquid. The evaporation process can occur at a temperature below the boiling point. So by evaporation only the liquid molecules on the surface get converted to the water vapour.

hope it helps u

Answer 2

This is because the particles of the sufcace got heated faster and evaporate first