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If temperature falls while water vapour remains the same, what generally happens to relative humidity?

Answer and explanation

Correct answer: It increases

Answer: B, relative humidity generally increases. Relative humidity compares the actual amount of water vapour with the air's saturation capacity at a particular temperature. When temperature falls but the actual vapour remains unchanged, the air's capacity to hold vapour becomes smaller. The same amount of vapour therefore represents a larger percentage of the available capacity. If cooling continues until the air reaches its dew point, relative humidity becomes 100 percent and condensation may begin. B is correct because it follows directly from this comparison. A is wrong because cooling does not normally increase the holding capacity; it reduces it. C is wrong because cooling does not remove all moisture or make the percentage zero. D is wrong because the denominator, or saturation capacity, changes with temperature even when actual vapour stays constant. A common confusion is to think that unchanged vapour means unchanged relative humidity. It does not: relative humidity depends on both vapour content and temperature. Memory cue: same moisture plus cooler air means a fuller, more humid percentage.

Related tags

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

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