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Why can evaporation slow down near a water surface in still air?

Answer and explanation

Correct answer: Because a moist boundary layer forms and brings air near saturation

Correct answer: A. Molecules can evaporate from a water surface, but the surrounding air must carry away or accept the added vapour. In still air, vapour accumulates close to the surface and forms a moist boundary layer. Its humidity approaches saturation, so the difference between the vapour pressure at the surface and in the nearby air becomes smaller. The net evaporation rate therefore slows. A is correct. B is wrong because increasing energy is not the stated reason for the slowdown. C is the opposite of still-air conditions. D is wrong because evaporation occurs even in calm air; strong wind only often increases its rate by replacing moist air. Memory cue: still air lets a moist layer stay; moving air removes it.

Related tags

Still AirBoundary LayerEvaporationHumidityAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeography

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