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If (e) is actual vapour pressure and (e_s) is saturation vapour pressure, which is the correct formula for (RH)?

Answer and explanation

Correct answer: (RH=\frac{e}{e_s}\times100)

Direct answer: B is correct: RH = (e/e_s) × 100. Relative humidity tells us how much water vapour is actually present compared with the maximum amount the air could hold at the same temperature. The actual vapour pressure is e, so it is placed in the numerator. The saturation vapour pressure is e_s, the reference maximum, so it is placed in the denominator. Multiplying by 100 expresses the ratio as a percentage. For example, if e is half of e_s, relative humidity is 50 percent. A is wrong because it reverses the comparison and could give an impossible value above 100 percent under ordinary unsaturated conditions. C is wrong because relative humidity is a ratio, not a sum. D is wrong because a difference does not express the percentage of saturation. Memory cue: actual over saturation, then multiply by 100—“A over S.”

Related tags

Relative HumidityFormulaVapour PressureSaturationHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeography

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