A state of a Chemical Substance at which all 3 basic states of matter (solid, liquid , gas) coexist in thermodynamic equilibrium.
For pure substance it only happens at one point on Phase Equilibrium Diagram with a certain temperature and pressure (see Fig. 1).
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| Fig. 1. Schematic PT diagram of a pure substance with Triple Point. |
See also
Natural Science / Physics / Thermodynamics / Thermodynamic system / Phase / Phase Equilibrium
[ State of matter ][ Pure substance ] [ Mixture ][ Fluid Mixture ]
[ Thermodynamic equilibrium ][ Vapour Liquid Equilibrium (VLE) ]
[ Phase Equilibrium Diagram ][ Gibbs Phase Rule ]