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Why can warm air hold more water vapour than cold air?

Answer and explanation

Correct answer: Because warm air has greater moisture-holding capacity

Answer: A. Temperature affects the amount of water vapour that air can contain before reaching saturation. When temperature rises, the saturation capacity of air increases, so warm air can contain more vapour than cold air before condensation begins. This does not mean that every parcel of warm air actually contains more vapour; it means its possible capacity is greater. A is therefore the correct general explanation. B is false because dust is not the basic reason for the temperature–capacity relationship. C is false because warm air is generally less dense than cold air at the same pressure, not always heavier. D is false because warm air still contains oxygen. Memory cue: warmer air has a larger moisture “capacity,” while cooling brings air closer to saturation.

Related tags

GeographyWarm AirMoisture CapacityHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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