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Why will dew not form if the surface remains warmer than the dew point?

Answer and explanation

Correct answer: Because the air near the surface will not reach saturation

Correct answer: A. The dew point is the temperature at which air becomes saturated with its existing water vapour. For dew to form, the surface and the air touching it must cool to the dew point or below it. At that stage, the air cannot hold all its vapour, so some vapour condenses into liquid droplets on the surface. If the surface stays warmer than the dew point, the nearby air is not cooled enough to become saturated; consequently, condensation does not begin. B is wrong because ice crystals describe frost under freezing conditions, not every case of failed dew formation. C is wrong because gravity continues to act on a warm surface. D is wrong because dew can form on land, plants, vehicles, and other surfaces, not only over the sea. Memory cue: no cooling to dew point, no dew.

Related tags

Dew FormationDew PointSaturationCondensationForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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