Question

Why evaporation I called as cooling process

Answer 1

Evaporation is a cooling process because when liquid turns to gas, it needs more energy, and so it has to take that energy from its surroundings. The energy is in the form of heat, and when the heat energy leaves with the evaporating liquid, the surroundings get cooler as a result. This has to do with the properties of the different states of matter.

Answer 2

as evaporation converts all our sweat into vapours and and make our body cool