Substances Triple Points
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
| Substance | Temperature (°C) | Pressure (kPa) |
|---|---|---|
| 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.
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.