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Why is it wrong to treat relative humidity as only the actual amount of water vapour?

Answer and explanation

Correct answer: Because it is a ratio of actual amount to saturation capacity

Correct answer: A. Relative humidity is a comparison, not an absolute amount by itself. In simple terms, it is the actual water vapour present divided by the saturation amount the air could hold at the same temperature, expressed as a percentage. Temperature matters because warm air generally has a greater saturation capacity than cool air. Thus two air samples can contain the same actual vapour but have different relative humidities if their temperatures differ. B is wrong because rainfall height measures precipitation, not atmospheric humidity. C is wrong because wind direction describes horizontal movement of air. D is wrong because soil moisture refers to water stored in soil, not the moisture condition of the atmosphere. Relative humidity can change when temperature changes even if the actual vapour amount changes little. Memory cue: “relative” means actual moisture compared with possible moisture at that temperature.

Related tags

Relative HumidityDefinitionSaturation CapacityTemperatureHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeography

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