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Why does the chance of dew formation increase on a clear calm night?

Answer and explanation

Correct answer: Surface can cool more by radiation

Direct answer: A. On a clear night, the ground can lose heat by terrestrial radiation without much cloud cover interrupting that loss. If the air is calm, there is less turbulent mixing with warmer air above, so a thin layer of moist air remains close to the cooling surface. When this layer reaches its dew point, water vapour condenses into liquid droplets on grass, leaves, or other surfaces. B is wrong because water vapour does not always disappear; it may condense. C is wrong because the Sun is not supplying daytime heating at night. D is unrelated to atmospheric moisture. Calm conditions do not create water by themselves; they help preserve the moist layer while radiational cooling lowers the temperature. Memory cue: clear allows cooling, calm allows moisture to stay.

Related tags

DewClear NightCalm AirRadiational CoolingForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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