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Which calculation correctly uses relative humidity?

Answer and explanation

Correct answer: Dividing actual vapour pressure by saturation vapour pressure and multiplying by 100

Answer: A. Relative humidity compares the water vapour actually present with the maximum water vapour the air could hold at the same temperature. If e is actual vapour pressure and es is saturation vapour pressure, the formula is RH = (e/es) × 100. For example, if actual vapour pressure is half the saturation value, relative humidity is 50 percent. A uses both the correct quantities and the correct order. B is not a definition of humidity and combines unrelated measurements. C subtracts quantities with different meanings and units. D also combines unrelated atmospheric and oceanic measurements. A common confusion is to reverse e and es; actual vapour pressure is the numerator and saturation vapour pressure is the denominator.

Related tags

GeographyRelative HumidityVapour PressureFormulaAtmosphereHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The Atmosphere

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