Abstract
The evaporation factor (ratio of local evaporation rate to the product of wind speed and deficit of the water-vapor density from its saturation value) was measured for a water surface considered to be hydrodynamically smooth. The evaporation from a section of a smooth water surface was compared with that from a small pan situated upon it. The evaporation factor for the pan located upon a larger water surface was then obtained, and the evaporation factor for the smooth water surface was deduced. It was found to vary with wind speed as expected, but is larger by 25 to 60 per cent than the theoretical factor for a water surface that is hydrodynamically smooth. Possible causes of the discrepancy between experiment and theory are considered.
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