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How can the presence of dust or salt particles in air affect condensation?

Answer and explanation

Correct answer: They can help condensation by giving surfaces for droplets

Answer: A. Dust and salt particles can act as condensation nuclei, which are tiny surfaces on which water vapour can gather and form droplets. Many atmospheric droplets begin more easily when vapour attaches to such particles than when it has to form in completely particle-free air. Option A is correct because these particles provide sites for droplet growth; they do not themselves become the water. Option B is wrong because particles do not always remove water vapour; under suitable conditions they help vapour condense. Option C is wrong because a particle cannot turn the whole atmosphere into water or create a river. Option D is wrong because dust and salt do not always lower air temperature below freezing. Their role is mainly as nuclei, not as universal cooling agents. Memory cue: a condensation nucleus is a tiny “starting surface” for a droplet.

Related tags

Condensation NucleiDustSalt ParticlesWater DropletsForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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