(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.

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