Synonym: Fluid Phase Equilibrium = Vapour Liquid Equilibrium (VLE)
A partial case of Phase Equilibrium with two fluid phases staying at Thermodynamic equilibrium.
In other words it's a state of thermodynamic equilibrium between the liquid and gas state of a Fluid Mixture.
The PT Diagram for Pure Substance will see Vapour Liquid Equilibrium (VLE) as a set of points along a smooth curve ending up with a Critical Point
(T_c, p_c) (see Fig. 1).
The PT Diagram for Fluid Mixture will see Vapour Liquid Equilibrium (VLE) as a closed region (also called Vapour Liquid Envelope) bounded by Bubblepoint Curve and Dewpoint Curve with a junction at Pseudo-Critical Point (T_{pc}, p_{pc}) (see Fig. 2).
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| Fig. 1. Schematic PT Diagram with Vapour Liquid Equilibrium curve and Critical Point. | Fig. 2. Schematic PT Diagram with Vapour Liquid Envelope and Pseudo-Critical Point. |
See also
Natural Science / Physics / Thermodynamics / Thermodynamic system / Thermodynamic equilibrium / Phase Equilibrium
[ State of matter ][ Pure substance ] [ Mixtures ][ Fluid Mixtures ][ Phase ]
[ Dewpoint Curve ][ Bubblepoint Curve ][ Vapour Liquid Envelope ]
[ Critical Point (Tc, Pc) ][ Сritical Temperature Tc ] [ Critical Pressure (pc) ][ Cricondentherm ][ Cricondenbar ]