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What generally happens to the capacity of air to hold water vapour when temperature increases?

Answer and explanation

Correct answer: Increases

Direct answer: D, it increases. Air has a limited capacity to contain water vapour at a particular temperature. When temperature rises, the air can generally hold more water vapour before becoming saturated. This is why warm air can be more humid in absolute terms than equally sized cool air, although actual humidity also depends on how much vapour is present. A is wrong because increasing temperature does not generally reduce the saturation capacity. B is wrong because the capacity does not end; it becomes greater. C is wrong because the capacity changes with temperature. D is correct because warmer air has a higher water-vapour-holding capacity. Do not confuse capacity with actual humidity: warming air may increase its capacity even if no additional vapour is added. Memory cue: warm air has more room for vapour; cool air reaches saturation sooner.

Related tags

TemperatureHumidityWater VapourAir CapacityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeography

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