Phase Equilibria Including a Vapor Phase

Abstract

As already presented in Sect. 1.2, some of the atoms or molecules tied to a solid or liquid, can, at a fixed temperature, leave the condensed phase. In a closed system a certain vapor pressure p is established, which depends, according to Eq. (1.1b), on the temperature. Equation (1.1b) is only valid when the enthalpy of vaporization dHV is independent of the temperature. This is not always true.