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Why is high relative humidity helpful in dew formation?

Answer and explanation

Correct answer: Because air can reach saturation with slight cooling

Correct answer: A. Relative humidity compares the water vapour actually present with the maximum amount the air can hold at that temperature. When relative humidity is high, the air is already close to saturation. During a clear, calm night, the ground and nearby objects lose heat and cool. Only a small further fall in temperature may then bring the air at the surface to its dew point. Water vapour can condense on grass, leaves or other cool surfaces and form dew. B is wrong because relative humidity directly concerns water vapour. C is wrong because high humidity does not always keep a surface warm; surface temperature depends on heat exchange. D is wrong because humidity does not remove condensation nuclei. Memory cue: high relative humidity means a short cooling distance to saturation, not extra heat.

Related tags

DewRelative HumiditySaturationDew PointForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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