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Why does relative humidity increase when moist air rises and cools?

Answer and explanation

Correct answer: Cooling reduces the air’s saturation capacity

A is correct. Relative humidity compares the water vapour present with the amount needed for saturation at the air’s current temperature. As moist air rises, it usually expands and cools. Cooling lowers its saturation capacity, so the same amount of vapour makes up a larger fraction of that capacity and relative humidity rises. If the air reaches its dew point, it becomes saturated and condensation may begin.

Related tags

Rising AirRelative HumidityHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeographyClass 12 Mcq

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