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Why do droplets in a cloud not remain the same size?

Answer and explanation

Correct answer: They experience different collision, condensation, and evaporation conditions

Correct answer: A. Cloud droplets are not created at exactly the same time or under exactly the same conditions. Within a cloud, air moves, temperature and humidity vary, and droplets follow different paths. Some droplets gain water vapour by condensation; others lose water through evaporation when the surrounding air is less humid. Droplets also collide because of air currents and differences in size and fall speed. Collisions may join small droplets into larger ones, while repeated movement can produce a wide range of sizes. In colder clouds, ice crystals may also grow at the expense of liquid droplets. B is wrong because cloud formation is continuous and droplets have different histories. C is wrong because clouds contain rising, sinking, and turbulent air. D is wrong because ordinary cloud droplets are liquid water, while some cloud particles are ice. Memory cue: changing air plus collisions means changing droplet size.

Related tags

Cloud MicrophysicsDroplet SizeCondensationClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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