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Why is the moist adiabatic lapse rate of the atmosphere lower than the dry adiabatic lapse rate?

Answer and explanation

Correct answer: Due to the release of latent heat during condensation

Correct answer: B. As an unsaturated air parcel rises, it expands and cools. Once it becomes saturated, water vapour condenses into tiny liquid droplets. Condensation releases latent heat into the surrounding air parcel. This released heat partly offsets the cooling caused by expansion, so the rising moist parcel loses temperature more slowly with height. Therefore, the moist adiabatic lapse rate is smaller than the dry adiabatic lapse rate. A is not the controlling reason; air density alone does not explain the difference. C may affect atmospheric conditions but is not the essential mechanism. D ozone is unrelated to this basic lapse-rate distinction. Memory cue: condensation gives heat back, so moist air cools slowly.

Related tags

Moist-Adiabatic-Lapse-RateLatent-HeatCondensationHydrological CycleThe Living WorldBiologyClass 11 Mcq

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