(a) What is evaporation? State the various factors which affect evaporation.
(d) Why does evaporation cool a liquid?
(a) The process of a liquid changing into vapour (or gas) even its boiling point is called evaporation.
Factors affecting Evaporation:
1). Temperature
2). Surface area
3). Humidity
4). Wind speed
(c) The cooling caused by evaporation is based on the fact that when a liquid evaporates, it takes the latent heat of vaporization from surroundings which it touches. By losing heat, the surroundings get cooled.