Into what does water vapour change during dew formation?

Correct answer: Into liquid water droplets

Correct answer: B, liquid water droplets. Dew forms when a surface and the nearby air cool enough for water vapour to reach its dew point. At this point, the vapour changes from a gas into liquid water. The liquid collects as tiny droplets on grass, leaves, vehicles, windows, or other cool surfaces. A is incorrect because dew does not transform into mountains; mountains are landforms, not a state of condensed water. C is incorrect because dust may provide a surface, but water vapour does not become dry dust. D is incorrect because salt grains are a different substance and are not produced by condensation. The important scientific change is gas to liquid: water vapour is the gas, and dew is the liquid product. If the temperature were low enough for ice crystals to form, the result would be frost rather than ordinary liquid dew. Memory cue: dew means “drops”; frost means “ice.”