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At constant temperature, why does relative humidity rise when the amount of water vapour in the air increases?

Answer and explanation

Correct answer: The saturation vapour pressure stays nearly constant while actual vapour pressure rises

A is correct. Relative humidity is (actual vapour pressure ÷ saturation vapour pressure) × 100. At constant temperature, saturation vapour pressure remains nearly constant. Adding water vapour raises actual vapour pressure, so the ratio—and therefore relative humidity—increases, potentially reaching 100 percent at saturation.

Related tags

Constant TemperatureRelative HumidityVapour PressureSaturationHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeography

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