3
Evaporation and Transpiration
Chapter Outline
3.2 Necessity of estimation of evaporation
3.3 Factors affecting evaporation
3.1 DEFINITION
Evaporation is an important process in the hydrologic cycle preceding precipitation. It is the process by which water in the liquid form transforms into vapour through the transfer of energy. The exact laws governing this phenomenon are not completely known.
The transformation from solid to the vapour state without passing through the usual intermediate liquid state is known as sublimation. In the atmosphere, evaporation occurs from free water surfaces like (1) seas, (2) lakes ...
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