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Why are condensation nuclei decisive in cloud droplet formation?

Answer and explanation

Correct answer: Because they provide tiny surfaces for water vapour

The correct answer is C. Condensation nuclei are very small particles suspended in the atmosphere, such as suitable dust, smoke, sea-salt, or other aerosol particles. When moist air cools to saturation or becomes sufficiently supersaturated, water vapour can collect on these tiny surfaces more readily than it would form droplets in completely particle-free air. The growing droplets may then make up cloud water. A is wrong because nuclei do not stop gravity; gravity can eventually make larger droplets fall. B is wrong because they do not convert air into oxygen. D is wrong because nuclei do not always raise temperature. Their key role is providing surfaces that help phase change from vapour to liquid. Memory cue: nuclei are microscopic landing platforms for water vapour, not sources of heat or oxygen.

Related tags

Condensation NucleiCloud DropletsHumidityClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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