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When fog forms, by which process does water vapour first change into droplets?

Answer and explanation

Correct answer: Condensation

Correct answer: A, condensation. Fog develops when moist air cools to its dew point or otherwise becomes unable to hold all its water vapour. The vapour then changes into numerous tiny liquid water droplets around microscopic particles in the air. These suspended droplets scatter light and make the air look cloudy near the ground. A is correct because condensation is the change of water vapour, a gas, into liquid water. B is wrong because weathering is the breakdown of rocks at or near Earth’s surface. C is wrong because erosion is the removal and transport of soil or rock by water, wind, ice, or gravity. D is wrong because volcanism involves magma and volcanic activity, not the ordinary formation of fog. The later movement, mixing, or evaporation of droplets may change the fog, but the first phase change asked here is condensation. Memory cue: gas to liquid is condensation.

Related tags

Fog FormationCondensationWater VapourPhase ChangeForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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