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Substances Triple Points

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Triple point:  The combination of the temperature and the pressure at which the three phases (gas, liquid, and solid) of a substance coexist in thermodynamic equilibrium.

Triple point for some common substances:

See also Critical Temperatures and Pressures for some common substances

Triple Points Substances


Acetylene -80.7 120
Air -213.40 5.265
Ammonia -77.75 6.076
Argon -189.34 68.9
Arsenic 820 3628
Butane -138.6 0.0007
Carbon (graphite) 4492 10132
Carbon dioxide -56.60 517
Carbon monoxide -205.05 15.37
Chloroform -97.72 0.870
Deuterium -254.52 17.1
Ethane -183.26 0.0008
Ethanol -123 0.00000043
Ethylene -169.2 0.12
Formic acid 8.25 2.2
Hexafluoroethane -100.07 26.60
Hydrogen -259.31 7.04
Hydrogen chloride -114.19 13.9
Iodine 113.50 12.07
Isobutane -159.60 0.000019481
Krypton -157.39 74.12
Mercury -39.0 0.000000165
Methane -182.47 11.7
Neon -248.58 43.2
Nitric oxide -163.65 21.92
Nitrogen -209.97 12.6
Nitrous oxide -90.81 87.85
Oxygen -218.79 0.152
Palladium 1552 0.0035
Platinum 1772 0.00020
Radon -71 70
Sulfur dioxide -75.46 1.67
Titanium 1668 0.0053
Uranium hexafluoride 64.02 151.7
Water 0.01 0.611657
Xenon -111.8 81.5
Zinc 419.50 0.065
  • 1 kPa (103 Pa) = 0.145 psi

The triple point is not the same as the critical point.

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Related Topics

Material Properties

Properties of gases, fluids and solids. Densities, specific heats, viscosities and more.

Related Documents

Acetone - Thermophysical Properties

Chemical, physical and thermal properties of acetone, also called 2-propanone, dimethyl ketone and pyroacetic acid. Phase diagram included.

Ammonia - NH3 - Thermodynamic Properties

Thermodynamic properties of saturated and superheated ammonia R-717 like specific volume, enthalpy and entropy.

Ammonia - Properties at Gas-Liquid Equilibrium Conditions

Figures and tables showing how the properties of liquid and gaseous ammonia changes along the boiling/condensation curve (temperature and pressure between triple point and critical point conditions). An ammonia phase diagram are included.

Benzene - Thermophysical properties

Chemical, physical and thermal properties of benzene, also called benzol. Phase diagram included.

Butane - Thermophysical Properties

Chemical, physical and thermal properties of n-Butane.

Critical Points for some Substances

Critical points of some common substances like air, argon, helium and more

Critical Temperatures and Pressures for some Common Substances

Critical temperatures and pressures for some common substances like air, alcohol, ether, oxygen and more.

Ethane Liquid - Thermal Properties

Density, specific heat and more of liquid ethane.

Ethylene - Thermophysical Properties

Chemical, physical and thermal properties of ethylene, also called ethene, acetene and olefiant gas. Phase diagram included.

Refrigerants - Physical Properties

Physical properties of refrigerants - molecular weight, boiling, freezing and critical points.

Water vs. Steam - Critical and Triple Points

Critical point is where vapor and liquid are indistinguishable and triple point is where ice, water and vapor coexist in thermodynamic equilibrium.

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