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If air is saturated, what may be the main result of further cooling?

Answer and explanation

Correct answer: Condensation or deposition

Direct answer: B is correct. Saturated air is already holding the maximum water vapour possible at its current temperature and pressure. If it cools further, its saturation capacity decreases, so the existing vapour becomes more than the air can retain. The excess water changes state: it may condense into liquid droplets, or, when conditions are below freezing, deposit directly as ice crystals. This can produce dew, fog, clouds, or frost depending on the surface and atmospheric conditions. B is correct because it includes both possible outcomes. A is wrong because cooling saturated air does not normally cause rapid evaporation. C is wrong because moisture changes form rather than disappearing. D is wrong because cooling does not make atmospheric pressure zero. Memory cue: saturated plus cooling means “water comes out”—as liquid by condensation or solid by deposition.

Related tags

Saturated AirCoolingCondensationDepositionHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeography

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