Question

why does evaporation cool a liquid?

Answer 1

Evaporation occurs when the particles of the liquid, absorb heat from the surrounding. The absorption of heat increases, the energy of the particles of the liquid, and they escape the liquid surface into gaseous form. Since, particle of liquid absorb heat from the surrounding, the amount of heat present in the surrounding decreases, which causes cooling in the surrounding....

you can take the example of our sweat..

Answer 2

Evaporation is a surface phenomenon where the surface !molecules of a liquid absorb the heat from the !molecules below them and attain the energy required for them to change into vapour state. As the surface molecules absorb the heat from the molecules below, they reduce the temperature of Tue liquid thus cooling it