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Which statement shows that specific humidity does not change directly like a temperature-based percentage?

Answer and explanation

Correct answer: It is the ratio of water vapour mass to moist air mass

Direct answer: A, because specific humidity is a mass ratio: the mass of water vapour divided by the total mass of moist air. It is usually expressed as a small mass of vapour per unit mass of moist air, rather than as a direct temperature percentage. Relative humidity is different: it compares actual vapour pressure with saturation vapour pressure, and saturation capacity changes strongly with temperature. Therefore, a temperature change can alter relative humidity even when the actual amount of vapour changes little. B is wrong because specific humidity is not the inverse percentage of saturation vapour pressure. C is wrong because visibility may be affected by moisture but is not the definition. D is wrong because humidity and temperature are different physical quantities with different units and meanings. Memory cue: specific humidity asks “how much vapour mass is present?”; relative humidity asks “how full is the air compared with its temperature-dependent limit?”

Related tags

Specific HumidityMass RatioRelative HumidityTemperatureHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeography

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