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Why does evaporation rate decrease when relative humidity is high?

Answer and explanation

Correct answer: Air is already rich in moisture

Correct answer: A. Evaporation occurs when water molecules leave a liquid surface and enter the air. For this to continue rapidly, the surrounding air should have room for additional water vapour. High relative humidity means that the air already contains a large proportion of the vapour it can hold at that temperature. The moisture difference between the wet surface and the air is therefore small, so fewer molecules can escape effectively and the evaporation rate falls. B is wrong because high humidity does not turn water into a solid. C is wrong because sunlight may still be present; humidity itself does not switch it off. D is unrelated because the absence of dust is not the main reason. Memory cue: humid air is already “nearly full,” while dry air has more space for vapour.

Related tags

GeographyRelative HumidityEvaporationMoisture GradientHumidityAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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