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At the same water temperature, why can strong wind increase evaporation compared with calm air?

Answer and explanation

Correct answer: Because it removes the saturated boundary layer

Direct answer: A is correct. Evaporation is faster when water molecules can escape into air that is not already full of water vapour. In calm conditions, a thin layer of moist, nearly saturated air develops immediately above the water surface. This boundary layer slows further evaporation because the difference in moisture between the surface and nearby air becomes small. Wind mixes away this saturated layer and replaces it with drier or less humid air. The moisture gradient becomes larger, so more water can evaporate at the same water temperature. A is correct because it describes this boundary-layer removal. B is wrong because wind does not immediately freeze water. C is wrong because wind transports water vapour rather than destroying it. D is obviously wrong and unrelated. Memory cue: wind refreshes the air above water; it does not create evaporation by magic.

Related tags

WindEvaporationBoundary LayerHumidityAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeography

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