https://doi.org/10.1351/goldbook.15320
Boundary of stable phase separation (limits of solubility) in a liquid or solid system of two or more components.
Notes:
- The locus of the compositions of two co-existing phases on a phase diagram.
- In a binary system, a plot of experimental variables such as temperature or pressure, or of theoretical variables such as Gibbs energy, against mole fraction displays the coexistence curve. In ternary or higher-order systems, coexistence curves are displayed on a plot of composition at constant temperature or pressure, usually on a ternary diagram.
See also: conjugate phases