+A **Phase Diagram** is a map revealing the stable physical states (phases) of a substance under varying conditions like [Temperature](/wiki/temperature) and [Pressure](/wiki/pressure). It charts the invisible borders where matter transitions between solid, liquid, and gas, or other distinct phases.
+## See also
+- [Phase Transition](/wiki/phase_transition)
+- [Thermodynamics](/wiki/thermodynamics)
+- [Triple Point](/wiki/triple_point)
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