Condensation

All the procedures (sublimation, vaporization, and fusion) take place during a heat addition to a substance. When heat is eliminated from a substance, the reverse procedures will take place.

The heat addition at a constant pressure to a saturated liquid will cause the liquid to evaporate (i.e., change phase from liquid to vapor). When heat is eliminated at a constant pressure from a saturated vapor, the condensation will take place and the vapor will change phase to liquid. Therefore the procedures of vaporization and condensation are the precise reverse of each other.

Likewise, freezing is the reverse process of fusion and melting. The sublimation also has a reverse process in which a gas goes directly to solid, though this procedure is not generally referred to with an exclusive term.