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Why does condensation occur in moist air rising along a mountain slope?

Answer and explanation

Correct answer: Because rising air expands and cools

Answer: A, because rising air expands and cools. Moist air forced up a mountain slope experiences lower surrounding pressure, so it expands. Expansion uses energy and the air cools without needing direct heat loss; this is called adiabatic cooling. As temperature falls, the air comes closer to its dew point, the temperature at which it becomes saturated. Further cooling causes water vapour to condense on tiny particles, forming cloud droplets and sometimes precipitation. A is correct because it states the physical chain. B is wrong: temperature usually decreases with height in the lower atmosphere, rather than always increasing. C is wrong because a mountain does not burn vapour. D is wrong because upward motion does not make humidity zero; it can increase relative humidity. Memory cue: lift, expand, cool, reach dew point, condense.

Related tags

Orographic LiftingCondensationAdiabatic CoolingHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeographyClass 12 Mcq

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