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Inside clouds during the water cycle, what is the name for liquid water droplets that remain unfrozen below 0°C?

Answer and explanation

Correct answer: Supercooling

Correct answer: B, supercooling. Pure or very small cloud droplets can remain liquid even when their temperature falls below the normal freezing point of water. Freezing usually needs an ice-nucleating particle or another suitable surface on which the first ice crystal can form. In clouds, droplets may therefore be supercooled until they encounter such a particle or a strong freezing condition. Once ice forms, the ice crystal can grow by taking water vapour from nearby liquid droplets, and this process contributes to precipitation formation. A is wrong because evaporation changes liquid water into vapour and does not describe unfrozen liquid below 0°C. C is the reverse of freezing: melting changes ice into liquid water. D is the direct change of solid ice into vapour, not liquid water remaining liquid. The term “supercooled” means cooled below the usual freezing point without freezing, not that the water has become warmer.

Related tags

SupercoolingCloudsFreezingHydrological CycleThe Living WorldBiologyClass 11 Mcq

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