This is a simulation of phase equilibrium for one mole of a binary system (A, B) that forms two partially-miscible liquids (α, β). The T-x-y diagram shows vapor-liquid equilibrium (VLE), liquid-liquid equilibrium (LLE), and vapor-liquid-liquid equilibrium (VLLE). The number of moles of each phase, which are shown in the bar graph (along with the mole fractions of component B in the phases), are determined from mole balances. The overall mole fraction of component B and the heat added are specified using the sliders.