Definitions for triple point
This page provides all possible meanings and translations of the word triple point
Random House Webster's College Dictionary
the particular temperature and pressure at which the solid, liquid, and gaseous phases of a given substance are all at equilibrium with one another.
Origin of triple point:
The unique temperature and pressure at which the solid, liquid and gas phases of a substance are all in equilibrium.
In thermodynamics, the triple point of a substance is the temperature and pressure at which the three phases of that substance coexist in thermodynamic equilibrium. For example, the triple point of mercury occurs at a temperature of −38.8344 °C and a pressure of 0.2 mPa. In addition to the triple point between solid, liquid, and gas, there can be triple points involving more than one solid phase, for substances with multiple polymorphs. Helium-4 is a special case that presents a triple point involving two different fluid phases. In general, for a system with p possible phases, there are triple points. The triple point of water is used to define the kelvin, the SI base 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. The triple points of several substances are used to define points in the ITS-90 international temperature scale, ranging from the triple point of hydrogen to the triple point of water.
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"triple point." Definitions.net. STANDS4 LLC, 2014. Web. 19 Dec. 2014. <http://www.definitions.net/definition/triple point>.