The gas constant is a physical constant denoted by R and is expressed in terms of units of energy per temperature increment per mole. It is also known as the ideal gas constant or molar gas constant or universal gas constant. The gas constant value is equivalent to the Boltzmann constant but expressed as the pressure-volume product instead of energy per increment of temperature per particle.
Gas Constant Value
In physics, the gas constant is the proportionality constant used to relate the energy scale to the temperature scale, when one mole of particles at a defined temperature is considered. The ideal gas constant is the combination of Boyle’s law, Avogadro’s number, Charles’s law and Gay-Lussac’s law. Thus, the gas constant R can be given as –
Gas constant R = 8.3144598(48) J⋅mol−1⋅K−1
The digits inside the parentheses are the uncertainty in the measurement of the gas constant value.
Read More: Boltzmann Constant
Gas Constant in Different Units
The gas constant is inversely used in diverse disciplines. Hence, it is expressed in many units. Some gas constant values in different units are listed below-
| Gas Constant Value | Units |
| 8.3144598(48) | J⋅K−1⋅mol−1 |
| 8.3144598(48)×103 | amu.m2.s-2.K-1 |
| 8.3144598(48)×10−2 | L.bar.K-1.mol-1 |
| 8.3144598(48) | m3.Pa.K-1.mol-1 |
| 62.363577(36) | L.Torr.K-1.mol-1 |
| 1.9872036(11)×10−3 | kcal.K-1.mol-1 |
| 8.2057338(47)×10−5 | m3.atm.K-1.mol-1 |
| 0.082057338(47) | L.atm.K-1.mol-1 |
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