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Why can lack of clouds help dew formation?

Answer and explanation

Correct answer: Because clear sky increases surface heat loss

Answer: A. At night, a clear sky allows the ground and other exposed surfaces to lose heat by outgoing radiation more effectively. The surface temperature can then fall to the dew point of the nearby air. When this happens, water vapour condenses into liquid droplets on grass, leaves, or other cool surfaces, producing dew. B is wrong because a clear sky does not destroy water vapour; moisture must be present for dew to form. C is wrong because clouds do not always produce frost, and frost requires temperatures at or below freezing. D is wrong because clear sky does not automatically make the whole atmosphere completely dry. Memory cue: clear night → stronger radiational cooling → surface reaches dew point → dew.

Related tags

DewClear SkyRadiational CoolingDew PointForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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