Question

why is the process of evaporation occurs only at the surface​

Answer 1

Answer:

So, after extreme cooling liquid cannot convert into gas or vapour. Evaporation is a type of vaporization. During evaporation liquid molecules from the surface of the liquid evaporates into the gas phase. So, evaporation takes place only from the surface, so evaporation is a surface phenomenon

Answer 2

Explanation:

Evaporation takes place only at the surface of a liquid, whereas boiling may occur throughout the liquid. In boiling, the change of state takes place at any point in the liquid where bubbles form. The bubbles then rise and break at the surface of the liquid. ... Evaporation can take place at any temperature.