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If the night is clear and calm but the air is very dry, why will dew formation be low?

Answer and explanation

Correct answer: Because water-vapour availability is low

Direct answer: B is correct. Clear skies and calm conditions can help a surface lose heat at night, but cooling alone does not guarantee dew. Dew forms only when air close to the surface contains enough water vapour and becomes saturated as the surface cools to its dew point. Very dry air contains little moisture, so even if the surface cools, there may not be enough vapour to produce visible liquid droplets. A is wrong because surfaces can cool on clear nights. C is wrong because calm air usually reduces mixing rather than automatically removing moisture. D is wrong because a dew point exists whenever air has water vapour. Memory cue: dew needs cooling plus moisture.

Related tags

DewDry AirDew PointHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeographyClass 12 Mcq

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