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If air descends down a slope and warms, what will happen to relative humidity?

Answer and explanation

Correct answer: It generally decreases because saturation capacity increases

Answer: A, relative humidity generally decreases. Relative humidity compares the water vapour actually present with the maximum vapour the air could hold at that temperature. When air descends, pressure compresses it and its temperature usually rises. Warmer air has a greater saturation capacity, while the actual amount of water vapour may not increase in the same proportion. Therefore the air moves farther from saturation and relative humidity falls. A is correct because warming increases saturation capacity. B is wrong because descending air does not automatically become saturated. C is wrong because descent does not convert all vapour into rain; cooling and condensation are required. D is wrong because vapour pressure does not become zero. Memory cue: rising air usually cools and becomes more humid; sinking air usually warms and becomes drier.

Related tags

Descending AirRelative HumidityCompression WarmingHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeographyClass 12 Mcq

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