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triple point

noun, Physics.
1.
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
1870-1875
First recorded in 1870-75
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for triple point
Historical Examples
• As to the general arrangement of the three univariant curves around the triple point, the following rules may be given.

Alexander Findlay
• The prolongation of each of the curves beyond the triple point must lie between the other two curves.

Alexander Findlay
• On passing through the triple point, therefore, there will be a change of the one form into the other.

Alexander Findlay
• The triple point S-S-V is not precisely the same as the transition point, but is very nearly so.

Alexander Findlay
• We shall, in the first place, consider only the triple point S-L-V.

Alexander Findlay
• The limiting temperature for these two cases, at which the division into three phases may occur, is called the triple point.

• It is possible, too, that long before the triple point is reached the whole liquid will have evaporated.

British Dictionary definitions for triple point

triple point

noun
1.
(chem) the temperature and pressure at which the three phases of a substance are in equilibrium. The triple point of water, 273.16 K at a pressure of 611.2 Pa, is the basis of the definition of the kelvin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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triple point in Medicine

triple point n.
The temperature and pressure at which three different phases, such as gaseous, liquid, and solid phases, of a particular substance can coexist in equilibrium.

The American Heritage® Stedman's Medical Dictionary
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triple point in Science
 triple point   The temperature and pressure at which a substance can exist in equilibrium in the liquid, solid, and gaseous states. The triple point of pure water is at 0.01°C (273.16K, 32.01°F) and 4.58 mm (611.2Pa) of mercury and is used to calibrate thermometers. Compare critical point.
The American Heritage® Science Dictionary
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triple point in Culture

triple point definition

In physics, the temperature at which all three phases of matter (solid, liquid, and gas) for a given substance can coexist.

Note: The triple point for water is a little above the freezing point, and is used to define temperature scales.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
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Difficulty index for triple point

Few English speakers likely know this word

Word Value for triple

8
10
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