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At low temperature, how is the water-vapour-holding capacity of air?

Answer and explanation

Correct answer: Low

Correct answer: C, low. The amount of water vapour that air can hold before becoming saturated depends strongly on temperature. Warm air has a greater capacity for water vapour, while cool air has a lower capacity. The reasoning is simple: when air cools, its saturation capacity decreases; if the air already contains more vapour than it can hold at the new temperature, the excess vapour may condense into tiny liquid droplets. C is therefore correct. A is wrong because high capacity is associated with warmer, not colder, air. B is wrong because the capacity is limited, not unlimited. D is wrong because capacity does not remain the same when temperature changes. Memory cue: warm air can hold more moisture; cold air can hold less.

Related tags

HumidityWater VapourAir TemperatureCondensationAtmospheric MoistureEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The Atmosphere

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