Definition:
Evaporation is the process whereby liquid water is converted to water vapour (vaporization) and removed from the evaporating surface (vapour removal). Water evaporates from a variety of surfaces, such as lakes, rivers, pavements, soils and wet vegetation.
Source:
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Food and Agriculture Organization of the United Nations, AQUASTAT Web Site
FAO, 2000, Crop evapotranspiration – Guidelines for computing crop water requirements, By: R. Allen, L. Pereira, D. Raes, M. Smith, Irrigation and Drainage Paper 56