Triple point

In physics, the triple point of a substance is the temperature and pressure at which three phases (gas, liquid, and solid) of that substance may coexist in thermodynamic equilibrium.

Related Topics:
Temperature - Pressure - Phases - Gas - Liquid - Solid - Thermodynamic

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For example, the triple point temperature of mercury is -38.8344 °C at a pressure of 0.2 mPa.

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The triple point of water is used to define the kelvin, the SI unit of thermodynamic temperature. The number given for the temperature of the triple point of water is an exact definition rather than a measured quantity.

Related Topics:
Kelvin - SI

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