Ideal gas constant
J/(mol·K)
The proportionality constant in the ideal gas law, relating pressure, volume, temperature and amount of gas. It equals the Boltzmann constant times the Avogadro constant — the per-mole version of k.
Used in
- Ideal gas law PV = nRT
- Thermodynamics energy calculations
- R = N_A × k
Source: SI defining constants / CODATA 2018