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What is the importance of tiny dust or salt particles in cloud formation?

Answer and explanation

Correct answer: They act as condensation nuclei and help droplets form.

Direct answer: A is correct. Cloud droplets form when water vapour condenses. In the atmosphere, tiny dust, salt, smoke, or similar particles can provide surfaces on which water molecules gather. These particles are called condensation nuclei. When moist air cools to saturation or becomes supersaturated, vapour can condense around the nuclei and produce very small droplets; many such droplets together make a cloud. The particles do not create water from nothing, and their role does not mean every cloud requires one identical material. B is wrong because nuclei help vapour become droplets rather than destroying it. C is wrong because they have no power to stop gravity. D is wrong because nuclei assist condensation and do not keep air permanently unsaturated. Memory cue: nuclei are “seeds” for droplets, not the droplets’ whole water supply.

Related tags

Condensation NucleiCloud FormationHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeographyClass 12 Mcq

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