liquid-vapor equilibrium

liquid-vapor equilibrium

[′lik·wəd ¦vā·pər ‚ē·kwə′lib·rē·əm]
(physical chemistry)
The equilibrium relationship between the liquid and its vapor phase for a partially vaporized compound or mixture at specified conditions of pressure and temperature; for mixtures, it is expressed by K = x/y, where K is the equilibrium constant, x the mole fraction of a key component in the vapor, and y the mole fraction of the same key component in the liquid. Also known as vapor-liquid equilibrium.