Definitions for triple point

This page provides all possible meanings and translations of the word triple point

WiktionaryRate this definition:(0.00 / 0 votes)

  1. triple point(Noun)

    The unique temperature and pressure at which the solid, liquid and gas phases of a substance are all in equilibrium.

FreebaseRate this definition:(0.00 / 0 votes)

  1. Triple point

    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.


Find a translation for the triple point definition in other languages:

Select another language:

Discuss these triple point definitions with the community:

Word of the Day

Would you like us to send you a FREE new word definition delivered to your inbox daily?

Please enter your email address:     


Use the citation below to add this definition to your bibliography:


"triple point." STANDS4 LLC, 2015. Web. 30 Mar. 2015. < point>.

Are we missing a good definition for triple point? Don't keep it to yourself...

The Web's Largest Resource for

Definitions & Translations

A Member Of The STANDS4 Network

Nearby & related entries:

Alternative searches for triple point:

Thanks for your vote! We truly appreciate your support.