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Phase diagram
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{{Use dmy dates|date=September 2023}} {{short description|Chart used to show conditions at which physical phases of a substance occur}} {{for multi|the use of this term in mathematics and physics|Phase portrait|and|Phase space}} [[File:Phase diagram of water simplified.svg|class=skin-invert-image|thumb|upright=1.35|Simplified temperature/pressure phase change diagram for water. The pressure on a pressure-temperature diagram (such as the water phase diagram shown above) is the [[partial pressure]] of the substance in question.]] A '''phase diagram''' in [[physical chemistry]], [[engineering]], [[mineralogy]], and [[materials science]] is a type of [[chart]] used to show conditions (pressure, temperature, etc.) at which thermodynamically distinct [[phase (matter)|phases]] (such as solid, liquid or gaseous states) occur and coexist at [[thermodynamic equilibrium|equilibrium]].
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