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What happens to the water vapour holding capacity of air when it cools?

Answer and explanation

Correct answer: It decreases

Direct answer: B, it decreases. For a given amount of air, warmer air can generally hold more water vapour before becoming saturated, while cooler air reaches saturation with less vapour. As air cools, its water-vapour holding capacity therefore falls. If the cooling continues until the air reaches the dew point, the excess vapour can condense into droplets or ice crystals. A is the reverse of the usual temperature relationship. B correctly explains why cooling encourages condensation. C is wrong because capacity changes with temperature. D is impossible and contradicts the idea of saturation, which is a limit rather than unlimited holding. Remember the sequence: cooling lowers capacity; saturation may be reached; further cooling can produce condensation. This describes capacity, not necessarily the actual amount of vapour already present.

Related tags

GeographyAtmospheric HumidityAir TemperatureCondensationHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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