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What is the correct description of the role of dust particles in fog formation?

Answer and explanation

Correct answer: They can provide tiny surfaces for droplet formation

Answer: A. Fog forms when moist air cools enough for water vapour to condense into tiny droplets. Dust, salt, smoke, and other minute particles can act as condensation nuclei. They provide small surfaces on which water vapour can gather and form droplets; they do not create the water themselves. A therefore gives the scientifically correct role. B is wrong because dust does not completely remove water vapour; moisture is needed for fog. C describes neither dust nor fog formation, since dust does not produce solar energy. D is impossible: dust cannot turn gaseous air into stone. The presence of nuclei alone is not sufficient; suitable moisture and cooling are also necessary. Memory cue: a nucleus is a tiny starting surface for a droplet.

Related tags

DustCondensation NucleiFog FormationWater DropletsForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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