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Under strong night-time surface cooling, in which condition is dew formation most likely?

Answer and explanation

Correct answer: Calm air and surface temperature reaching dew point

The correct answer is D. Dew forms when a surface cools to the dew point of the air immediately above it. Strong night-time radiational cooling is most effective under relatively clear skies, while calm or light winds allow a shallow layer of air near the ground to cool without being mixed rapidly with warmer air above. Once the surface reaches the dew point, nearby air becomes saturated and water vapour condenses into liquid droplets on grass, leaves, or other surfaces. A is wrong because strong dry wind encourages mixing and the low moisture gives little vapour for dew. B is wrong because a surface above the dew point has not reached saturation. C is wrong because clouds reduce outgoing radiation and a warm night is less favourable. Memory cue: clear, calm, moist, and dew-point conditions favour dew.

Related tags

DewRadiational CoolingDew PointForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeographyClass 12 Mcq

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