# Evaporation

type of vaporization of a liquid that occurs from its surface; surface phenomenon

Evaporation is a type of vaporization of a liquid that occurs from the surface of a liquid into a gaseous phase that is not saturated with the evaporating substance. The other type of vaporization is boiling, which is characterized by bubbles of saturated vapor forming in the liquid phase.

## Quotes

• In general, the rate of evaporation (m) of a substance in a high vacuum is related to the pressure (p) of the saturated vapor by the equation ${\displaystyle m={\sqrt {\frac {M}{2\pi RT}}}p.}$  Red phosphorus and some other substances probably form exceptions to this rule.
• Irving Langmuir, "The Constitution and Fundamental Properties of Solids and Liquids. Part I. Solids.", Journal of the American Chemical Society, September 5, 1916