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Why can relative humidity near the surface be high during dew formation?

Answer and explanation

Correct answer: Surface cooling brings the air close to saturation

Answer: A. Relative humidity compares the water vapour actually present in air with the maximum amount that air can hold at that temperature. Cooling does not necessarily remove moisture. Instead, as air cools, its capacity to hold water vapour decreases. If the amount of vapour remains nearly the same, the relative humidity rises. When the air reaches saturation, relative humidity is about 100%, and further cooling can produce dew on the surface. Option A is correct because surface cooling brings nearby air toward saturation. Option B is wrong because vapour does not simply disappear; some of it may condense. Option C is wrong because cooling can increase, not always decrease, relative humidity. Option D is wrong because air pressure need not vanish for dew to form. Memory cue: same moisture plus lower temperature means higher relative humidity.

Related tags

DewRelative HumiditySurface CoolingForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeographyClass 12 Mcq

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