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If actual vapour pressure remains constant and temperature rises what is the main reason for relative humidity decreasing?

Answer and explanation

Correct answer: Saturation vapour pressure increases

Correct answer: C. Relative humidity compares the actual water vapour pressure with the saturation vapour pressure at the same temperature: relative humidity is actual vapour pressure divided by saturation vapour pressure, expressed as a percentage. When temperature rises, saturation vapour pressure increases because warmer air has a greater capacity to contain water vapour. In the question, the actual vapour pressure stays constant, so the numerator does not fall; the denominator becomes larger. The same amount of vapour therefore represents a smaller percentage of the air’s possible moisture capacity, and relative humidity decreases. A contradicts the stated condition. B does not follow from warming and constant vapour pressure. D is an unsupported absolute claim and is unrelated. Cue: fixed numerator, larger denominator, lower percentage.

Related tags

GeographyRelative HumiditySaturation Vapour PressureAtmospheric MoistureHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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