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In a closed room temperature is lowered but the actual amount of water vapour does not change which result is most likely?

Answer and explanation

Correct answer: Relative humidity will increase

Correct answer: A. In a closed room, the actual amount of water vapour is initially unchanged. Lowering temperature reduces the saturation capacity of the air: at the cooler temperature, the air can hold less vapour before reaching saturation. Relative humidity is the actual moisture compared with that saturation capacity. Therefore the same actual vapour amount occupies a larger fraction of the reduced capacity, so relative humidity rises. If cooling continues to the dew point, condensation may begin, but that does not make condensation impossible. B is wrong because unchanged vapour is not zero. C is wrong because cooling alone does not automatically double the actual mass of vapour. D is the opposite of the likely effect. Warning: relative humidity can rise even when actual moisture does not increase.

Related tags

GeographyTemperatureRelative HumidityDew PointHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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