15346 IUPAC Gold Book - phase diagram 10.1351/goldbook.15346 15346 current 1 Graphical representation, by use of points, lines, and surfaces, of the phases present at chemical equilibrium in unary, binary, ternary, and higher-order systems containing two or more phases. Phase diagrams may employ any pairs of the variables temperature, pressure, and compositions of various phases. Thus, temperature-composition and pressure-composition phase diagrams are possible, as well as diagrams showing only compositions under isothermal or isobaric conditions. binary https://goldbook.iupac.org//terms/view/15316 higher-order systems https://goldbook.iupac.org//terms/view/15332 isopleths https://goldbook.iupac.org//terms/view/15336 ternary https://goldbook.iupac.org//terms/view/15366 PAC, 2008, 80, 233. 'Glossary of terms related to solubility (IUPAC Recommendations 2008)' on page 259 (https://doi.org/10.1351/pac200880020233) https://goldbook.iupac.org/terms/view/15346/html https://goldbook.iupac.org/terms/view/15346/json https://goldbook.iupac.org/terms/view/15346/plain Citation: 'phase diagram' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.15346 The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using. 2026-04-19T04:16:33+00:00