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Why can cloud droplet size remain small when condensation nuclei are very numerous?

Answer and explanation

Correct answer: Moisture gets distributed over many tiny surfaces

Correct answer: A. Condensation nuclei are tiny particles such as dust, salt or smoke on which water vapour can condense. If the available moisture is spread over a very large number of nuclei, many droplets form, but each droplet receives only a small share of the water. Consequently, the average droplet remains small unless droplets collide, combine, or continue receiving enough vapour to grow. Small droplets may remain suspended in a cloud and may not have enough mass to fall as precipitation. Option A correctly describes the sharing of moisture among many surfaces. Option B is wrong because nuclei provide surfaces; they do not normally destroy water vapour. Option C is wrong because the cloud still contains water in droplets. Option D is wrong because frost formation requires suitable freezing conditions and is not an automatic result. Memory cue: more nuclei can mean more droplets, but less water per droplet.

Related tags

Condensation NucleiDroplet SizeCloud MicrophysicsHumidityClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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