Condensation is the change of the physical
state of matter from
gas phase into
liquid phase, and is the reverse of
evaporation. The word most often refers to the water cycle. It can also be defined as the change in the state of water vapour to liquid water when in contact with a liquid or solid surface or
cloud condensation nuclei within the
atmosphere. When the transition happens from the gaseous phase into the solid phase directly, the change is called
deposition.