What Is Triple Point ?

What is Triple Point ?

The Triple is considered as a thermodynamic equillibrium point. At this point all the three states of an element; Solid, Liquid & Gas form considered at an equillibrium. Triple point is different for different system.

Example,  Triple point of Acetylene occurs at -80.7° Celsius.

Triple point of any substance is a single point at a peculiar temperature and pressure. It is the point where all the three phases coexists at equillibrium.

Equillibrium Diagram

For Example : Consider water as a system. The triple point of water is at 273.16 K and the assosiated pressure is 611.2 Pa.

Triple Point Of Water

Similarly, For Carbon Dioxide the triple point coexist at 5.2 atm (3952 torr) and 216.6 K (-56.4oC).

Read Also :

Psychrometric Chart

Phase Change Nomenclature 

Phase Change

Solid to Liquid : Melting

Liquid to Solid : Freezing

Liquid to Gas : Vaporization

Gas to Liquid : Condensation

Solid to Gas : Sublimation

Gas to Solid : Deposition

Data Source : Chemistry LibreTexts;

ImageSource : Wikipedia; UW-Platteville

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