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Why is cooling of air often necessary before condensation of water vapour?

Answer and explanation

Correct answer: Because cooling reduces saturation capacity and can bring air to dew point

Correct answer: A. Air can hold only a limited amount of water vapour at a particular temperature. Warm air generally has a greater saturation capacity than cool air. When moist air cools, its saturation capacity decreases while the actual vapour may remain nearly unchanged. If the air cools to its dew point, it becomes saturated, with relative humidity reaching about 100%. Further cooling, or suitable condensation nuclei, allows some vapour to change into liquid droplets. B is wrong because cooling does not normally increase the amount of vapour; it reduces the amount the air can hold. C is wrong because cooling does not always remove moisture or make air dry. D is wrong because cooling does not remove condensation nuclei; such particles often help droplets form. Memory cue: cooling reduces capacity, and reaching the dew point permits condensation.

Related tags

CoolingDew PointCondensationHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeography

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