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Which sequence is correct when rising air reaches the condensation level?

Answer and explanation

Correct answer: Expansion then cooling then saturation then condensation

The correct answer is B. As an air parcel rises, the surrounding pressure generally decreases. The parcel expands, and this expansion causes adiabatic cooling when there is no immediate exchange of heat sufficient to offset it. Cooling reduces the air’s saturation capacity. If the parcel continues to cool until its temperature reaches the dew point, it becomes saturated. Further cooling or suitable conditions allow water vapour to condense on condensation nuclei, producing cloud droplets. A is wrong because rising air expands and cools rather than being compressed and strongly heated. C and D contain unrelated processes and the impossible idea of pressure or vapour pressure simply becoming zero. Memory cue: uplift gives expansion, cooling, saturation, and then condensation—the order matters.

Related tags

Adiabatic CoolingCondensation LevelRising AirHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeographyClass 12 Mcq

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