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Relative humidity can decrease even when the actual amount of water vapour in air remains the same. What is the deeper reason?

Answer and explanation

Correct answer: Saturation vapour pressure increases as temperature rises

The correct answer is A. Relative humidity is the ratio of actual water-vapour pressure to saturation vapour pressure at the same temperature, usually expressed as a percentage. When air warms, the saturation vapour pressure rises: warmer air has a greater capacity for vapour before saturation. If the actual vapour pressure stays approximately constant, the denominator of the ratio becomes larger, so relative humidity decreases even though no vapour has been removed. B is wrong because warming does not destroy water vapour. C is physically meaningless in this situation. D is wrong because condensation is not compulsory at every temperature; it occurs when air reaches saturation and suitable conditions exist. Memory cue: same vapour divided by a larger saturation capacity gives a lower relative humidity.

Related tags

Relative HumidityTemperatureVapour PressureHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeographyClass 12 Mcq

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