Discussion
The process by which water vapour in the atmosphere changes into liquid droplets to form clouds is called
Answer: A
Correct answer: Condensation
Condensation is the change from vapour to liquid, and it is what forms clouds. Rising air expands and cools; cooler air holds less water vapour, so once the parcel reaches saturation the surplus vapour condenses onto microscopic particles - dust, salt, smoke - called condensation nuclei. Without those nuclei the air would simply become supersaturated. The height at which this begins is the condensation level, which is why the flat bases of fair-weather cumulus clouds all sit at the same altitude on a given day. The other three are the neighbouring stages of the water cycle: evaporation turns liquid water to vapour, transpiration releases vapour from plant leaves, and infiltration is the soaking of water down into the soil.
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