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If an air mass is cooled without adding moisture, why does relative humidity increase?

Answer and explanation

Correct answer: Because saturation capacity decreases

The correct answer is C. Cooling reduces the amount of water vapour that air can hold before reaching saturation. If no moisture is added or removed, the actual vapour amount remains approximately the same while the saturation capacity decreases. Consequently, the existing vapour becomes a larger fraction of the possible amount, so relative humidity rises. With continued cooling, the air may reach the dew point; further cooling can then lead to condensation, provided suitable nuclei and conditions are present. A is wrong because actual vapour pressure does not necessarily become zero. B is wrong because water vapour does not become solid rock. D is wrong because cooling does not make air pressure disappear. Memory cue: cooling narrows the air’s moisture capacity, so the same moisture fills a greater percentage.

Related tags

CoolingRelative HumiditySaturation CapacityHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeographyClass 12 Mcq

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