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Before cloud formation, water vapour generally has to reach which condition?

Answer and explanation

Correct answer: Saturation or dew point

Direct answer: B, saturation or the dew point. Cloud formation begins when moist air becomes saturated, meaning it contains as much water vapour as it can hold at that temperature. This commonly happens when air rises and cools to its dew point. After saturation, further cooling or the presence of suitable condensation surfaces allows water vapour to change into tiny liquid droplets or ice crystals. These suspended particles together appear as a cloud. A is wrong because complete dryness contains no water vapour for cloud formation. C is wrong because zero pressure is not the required condition and is not a normal description of cloud formation. D is wrong because salinity is not the condition that makes atmospheric water vapour condense. Saturation is about the relationship between vapour content and temperature. Memory cue: cool to the dew point, then condensation can begin.

Related tags

GeographyCloud FormationSaturationDew PointHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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