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What relation between the ground surface and nearby air helps dew formation?

Answer and explanation

Correct answer: The surface should be cool enough for nearby air to reach dew point

Correct answer: A. Dew forms when a surface cools the moist air directly touching or lying close to it until that air reaches its dew point. At the dew point, the air becomes saturated and excess water vapour condenses into liquid drops on the surface. The surface itself does not need to be hot; it usually loses heat and becomes cooler than the nearby air. A is correct because it states the necessary thermal relationship and includes the dew point. B is wrong because a very hot surface promotes evaporation and makes condensation less likely. C is wrong because water vapour is the source of dew. D is wrong because heat exchange between the surface and nearby air is central to the process. Memory cue: a cool surface makes nearby moist air reach the dew point.

Related tags

DewSurface TemperatureDew PointCondensationForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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