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If on a clear night the surface reaches dew point but water vapour in air is very low what will happen to dew formation?

Answer and explanation

Correct answer: Dew formation will remain limited

Correct answer: A. Reaching the dew point means that air has cooled to the temperature at which it becomes saturated with the water vapour currently present. However, the amount of vapour matters. If the air contains very little moisture, saturation involves only a small amount of water, so only a small quantity of dew can form even when the surface reaches the dew point. Clear skies favour radiational cooling, but cooling alone cannot supply missing moisture. B is wrong because low vapour does not necessarily produce dense fog. C is wrong because frost requires sufficiently cold conditions and ice deposition, not merely a dew point. D is wrong because reaching the dew point does not immediately cause rainfall. Memory cue: dew needs both cooling and moisture.

Related tags

DewDew PointMoisture LimitationNight CoolingForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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