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Why is cooling necessary in cloud formation?

Answer and explanation

Correct answer: Because cooling can condense water vapour

Direct answer: B, because cooling can condense water vapour. Warm air can contain water vapour. When moist air cools to its dew point, it may become saturated, meaning it cannot retain all the vapour as invisible gas. The excess vapour changes into tiny liquid droplets, or into ice crystals when temperatures are sufficiently low. These droplets and crystals gather around small particles in the air and together form visible clouds. A is wrong because cooling does not destroy air; it changes temperature and may change water vapour into condensed water. C is wrong because cooling does not stop the Sun. D is wrong because soil is not transformed directly into a cloud; water evaporates from surfaces, enters the air as vapour, and later condenses. Cooling is therefore a necessary condition for condensation, though moisture and suitable condensation nuclei are also important. Memory cue: cooling turns invisible vapour into visible cloud droplets.

Related tags

CoolingCloud-FormationCondensationWater-VapourHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeography

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