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When relative humidity is very high, how is evaporation generally?

Answer and explanation

Correct answer: Slow

Direct answer: C, slow. Very high relative humidity means that the air already contains a large proportion of the water vapour it can hold at its current temperature. Therefore, the difference between the wet surface and the surrounding air is small, so fewer water molecules leave the surface in a given time. A is wrong because very humid air generally does not accept new vapour quickly. B is too absolute: evaporation may become extremely slow under saturated conditions, but the question asks for the general tendency, not an automatic sudden stop in every situation. D is wrong because high humidity means the air is closer to its limit, not that its capacity is unlimited. C is correct. Wind or heating may still affect the actual rate, so relative humidity is important but not the only factor. Memory cue: humid air is already nearly full; dry air has more room.

Related tags

Relative HumidityEvaporationMoist AirSaturationHumidityAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeography

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