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Why can evaporation be very rapid in hot desert air even when actual moisture is low?

Answer and explanation

Correct answer: Air has high capacity to take moisture

Direct answer: A. Hot desert air usually has high temperature and low relative humidity. Temperature raises the amount of water vapour that the air could hold before saturation, while the low actual moisture means much of that capacity is still available. Water at an exposed surface can therefore evaporate rapidly, especially when heat and wind supply energy and remove moist air. B is wrong because desert air is not always saturated; it is commonly dry and has considerable remaining capacity. C is wrong because deserts are characteristically associated with high heat in the situation described, not temperatures always below freezing. D is wrong because evaporation requires energy, mainly heat, to allow liquid molecules to escape into the vapour state. A is correct because it explains why dry air can accept more vapour. Memory cue: hot plus dry means high evaporative demand; do not confuse low actual moisture with low moisture capacity.

Related tags

GeographyDesertEvaporationRelative HumidityHumidityAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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