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If (e) remains constant in (RH=\frac{e}{e_s}\times100) and temperature rises, why can (RH) decrease?

Answer and explanation

Correct answer: Because (e_s) increases with temperature

Correct answer: A. Relative humidity is calculated as RH = (e/e_s) × 100, where e is the actual vapour pressure and e_s is the saturation vapour pressure at the same temperature. If e stays constant while temperature rises, e_s increases because warm air can support a higher saturation vapour pressure. The denominator therefore becomes larger, so the ratio e/e_s and hence relative humidity can fall. A is correct. B is wrong because constant e does not become infinite. C is wrong because temperature strongly affects e_s. D is wrong because RH is 100% only when actual vapour pressure equals saturation vapour pressure. Memory cue: with moisture unchanged, warming usually lowers RH because the saturation capacity rises.

Related tags

Relative HumidityFormulaSaturation Vapour PressureTemperatureHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeography

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