Last winter, the foggy weather in Anning was more frequent than in previous years, but the frost was less common than in previous years. From the analysis of the change of material state, the formatio

Last winter, the foggy weather in Anning was more frequent than in previous years, but the frost was less common than in previous years. From the analysis of the change of material state, the formation of "fog" belongs to the phenomenon of _ _ _ _ _. (1) Fog is a liquefaction phenomenon, which is formed by water vapor condensing into small water droplets and combining with dust in the air.

(2) Frost is a small ice crystal that water vapor turns into when it is cold, which is a condensation phenomenon;

(3) When the temperature rises at noon on foggy days, the water droplets formed by fog absorb heat and turn into steam, which is a vaporization phenomenon.

So the answer is: liquefaction; Ninghua; evaporate