Abstract
THE rate of evaporation from small, moist surfaces can be estimated with the following formula1: 
where E is the water evaporated/unit of surface/unit of time, p0 is the vapour pressure at the evaporating surface, Pd is the vapour pressure of the ambient air, v is the velocity of the wind, x is the length of the evaporating surface in the direction of the wind, and n is an exponent expressing the rate of change of thickness of the boundary layer with a change in v or x or both.
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References
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Machin, J., J. Exp. Biol., 41, 783 (1964).
Slieght, R. B., J. Agric. Res., 10, 209 (1917).
Schmid, W. D., Ecology, 46, 261 (1965).
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SPIGHT, T. Evaporation from Toads and Water Surfaces. Nature 214, 835–836 (1967). https://doi.org/10.1038/214835a0
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DOI: https://doi.org/10.1038/214835a0
