Evaporation and condensation are the same process going in different directions: evaporation is the process of a liquid turning into a gas, and condensation is the process of a gas turning into a liquid. The term evaporation refers to the process when it is unforced: evaporation occurs well below the boiling point, as can be seen in daily life. These processes are studied as a part of the larger field of thermodynamics. Each substance will have its own energies of condensation and evaporation, due to the size and bond structure of the molecules.

Evaporation occurs with those molecules of a liquid that have greater kinetic energy. These molecules can have enough energy to escape the surface tension of the liquid and the attractive molecular forces within the liquid. The escape of the more energetic particles will make the average temperature of the remaining particles...