The binodal is the coexistence boundary: its two branches give the compositions of phases joined by the common-tangent construction.
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"Binodal" generally refers to a concept used in the context of phase diagrams, particularly in material science and thermodynamics. In a phase diagram, the binodal curve represents the boundary between different phases or states of a system. For example, in a liquid-liquid phase separation, the binodal curve indicates the composition range in which two immiscible phases can coexist.