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Frost forming on plant leaves during winter demonstrates which phase change?

Answer and explanation

Correct answer: Deposition

Correct answer: B, deposition. Frost consists of ice crystals that form when water vapour in the air changes directly into solid ice on a surface that is cold enough. The phase sequence is gas to solid, and this direct change is called deposition. It does not first require the vapour to become liquid water. A, evaporation, is the opposite type of change from liquid water to vapour, so it cannot describe the formation of ice crystals. C, condensation, is the change from gas to liquid, such as water vapour becoming liquid droplets; ordinary dew is a familiar example. Although cooling is involved in both processes, frost is deposition when the final product is ice formed directly from vapour. D, melting, is solid to liquid and would describe ice turning into water, not frost forming. A helpful memory cue is to pair opposite directions: vapour to liquid is condensation, vapour to solid is deposition, and solid to liquid is melting.

Related tags

FrostDepositionPhase ChangesWater CycleHydrological CycleThe Living WorldBiologyClass 11 Mcq

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