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When can surface being colder than air temperature be important in dew formation?

Answer and explanation

Correct answer: When the surface reaches dew point by radiation

Answer: A. Dew forms on a surface when that surface cools to or below the dew point of the nearby moist air. During a clear night, the ground and objects can lose heat by outgoing radiation and become colder than the air a little above them. If sufficient water vapour is present, condensation then occurs on the surface as dew. A correctly connects radiational cooling with reaching the dew point. B is wrong because air without water vapour cannot supply dew. C usually describes warming and drying conditions, not the calm radiational cooling favourable to dew. D is unrelated to the physical definition of dew. The important distinction is that the surface temperature, not only the general air temperature, controls the deposit. Memory cue: a cool surface plus moist air plus dew point produces dew.

Related tags

DewSurface TemperatureRadiational CoolingDew PointForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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