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Why do microscopic dust and salt particles help water vapour condense in the atmosphere?

Answer and explanation

Correct answer: They act as condensation nuclei

The correct answer is B: dust and salt particles act as condensation nuclei. Water vapour molecules can gather on the surfaces of suitable tiny particles suspended in air. This gives the molecules a starting surface on which liquid droplets or, under cold conditions, ice crystals can form. Many atmospheric particles are hygroscopic, meaning they attract or readily take up water. As more vapour collects, droplets grow and may become part of a cloud. A is incorrect because these particles do not warm the water; cooling generally favours condensation. C concerns appearance, not the physical cause of droplet formation. D is false because particles do not remove gravity. The particles help condensation, but temperature and humidity are also important. Memory cue: nuclei are tiny “seeds” around which cloud droplets grow.

Related tags

Condensation NucleiCloud FormationDustSalt ParticlesHydrological CycleThe Living WorldBiologyClass 11 Mcq

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