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Why can mist or fog form when warm, moist air moves over a cold surface?

Answer and explanation

Correct answer: Because the air cools to its dew point.

Direct answer: A is correct. Warm, moist air contains water vapour. When it passes over a colder land or water surface, heat is transferred from the air to that surface, so the air temperature falls. If it reaches the dew point, the air becomes saturated and some vapour condenses into very small droplets. When these droplets remain suspended near the ground, they form mist or fog. B is wrong because a cold surface cools the adjacent air rather than heating its vapour. C is wrong because condensation requires moisture; the moisture does not fall to zero. D is wrong because sea waves are not the necessary explanation in this situation. Fog and mist are both near-surface suspended droplets, although the usual visibility distinction may vary by definition. Memory cue: warm moist air over cold ground means contact cooling toward the dew point.

Related tags

FogMistDew PointForms Of Condensation: DewFrostAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeographyClass 12 Mcq

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