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Before fog formation, air needs to reach near which state?

Answer and explanation

Correct answer: Saturation

Answer: A, saturation. Air contains a limited amount of water vapour at a particular temperature. As moist air cools, its capacity to hold vapour decreases. When it reaches saturation, it is holding nearly the maximum vapour possible at that temperature. Further cooling, or suitable condensation nuclei, allows some vapour to become tiny liquid droplets suspended near the ground; these droplets form fog. A is correct because near-saturation is the necessary state before condensation becomes visible. B is wrong because dry air lacks sufficient vapour. C is wrong because salinity is a property of seawater, not an atmospheric state needed for fog. D is wrong because underground boiling is unrelated. Memory cue: cool moist air approaches saturation, then condensation can produce fog.

Related tags

FogSaturationCondensationWater VapourForms Of Condensation: DewFrostAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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