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If dust particles are absent in air, what difficulty would occur in cloud formation?

Answer and explanation

Correct answer: Water vapour will have fewer nuclei to condense on

Correct answer: A. Clouds form when water vapour cools and changes into very small liquid droplets or ice particles. In the atmosphere, dust, salt and other tiny particles often act as condensation nuclei, meaning surfaces on which water vapour can begin forming droplets. If these particles are absent, cloud-droplet formation becomes more difficult, although it is not necessarily impossible. Option A correctly identifies the missing support for condensation. B is wrong because sunlight is unrelated to the presence of dust nuclei. C is wrong because removing dust does not make atmospheric pressure zero. D is wrong because the sea does not dry up merely because cloud formation is hindered. Memory cue: nuclei are tiny ‘starting surfaces’ for cloud droplets.

Related tags

GeographyCondensation NucleiCloud FormationAtmospheric MoistureHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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