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If two places have the same actual water vapour but one is cooler, why will relative humidity be higher there?

Answer and explanation

Correct answer: Because cooler air has lower saturation capacity.

Direct answer: A is correct. Relative humidity is the ratio between the water vapour actually present and the maximum vapour the air can hold at its current temperature. Suppose two places contain the same actual amount of vapour. The cooler place has a lower saturation capacity, so that same amount occupies a larger fraction of its possible capacity. Its relative humidity is therefore higher and it may be closer to condensation. B is wrong because water vapour still has mass in cool air. C is wrong because cooling does not change water into oxygen; that would be a chemical transformation, not ordinary cooling. D is wrong because cold conditions do not always prevent rainfall; precipitation depends on several atmospheric processes. Memory cue: same vapour divided by a smaller capacity gives a larger relative humidity.

Related tags

TemperatureRelative HumiditySaturation CapacityHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeographyClass 12 Mcq

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