Condensation ? ?

Condensation is the process by which water vapor in the air cools and turns into liquid water. This often occurs when warm, moist air comes into contact with a cooler surface, causing the water vapor to condense and form droplets. This can be seen on windows, mirrors, and other surfaces when the air inside a room is warmer and more humid than the air outside.

takes place when water vapour
(gas) changes to a liquid (water)