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 region on PT Diagram where both 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 (see Fig. 1).The PT Diagram for Fluid Mixture will see Vapour Liquid Equilibrium (VLE) as a closed area with a junction at Pseudo-Critical Point
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(see Fig. 2 share the same volume and each occupying a certain percentage of this volume (see Fig. 1).
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