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Before ice particles or water droplets form, what must happen to water vapour?

Answer and explanation

Correct answer: It must condense

Direct answer: A, it must condense. Water vapour is invisible gas. When moist air cools sufficiently, the vapour changes into tiny liquid water droplets; this change is condensation. If temperatures are very low, water can form ice particles instead. These droplets and ice particles are the small visible components of clouds, and their later growth can contribute to precipitation. A is therefore the only scientifically suitable choice. B is wrong because water vapour does not need to burn to form cloud particles. C is wrong because the vapour changes state rather than disappearing. D is unrelated to atmospheric water and soil formation. A small refinement is useful: condensation commonly describes vapour becoming liquid, while deposition can describe vapour changing directly into ice; at school level, cooling and condensation are the key idea behind cloud-particle formation. Memory cue: invisible vapour becomes visible cloud particles after cooling.

Related tags

GeographyWater DropletsIce ParticlesCondensationClouds And PrecipitationWater In The AtmosphereClass 12 Mcq

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