# Ideal gas constant

The ideal gas constant is also known as the molar gas constant, the gas constant or the universal gas constant. This constant is written as , and is a constant of proportionality (constant number that is multiplied on one side of a proportional relationship to make them equal) for the ideal gas law.[1] The ideal gas law is simply where is pressure, is volume, is the number of moles of gas, and is the ideal gas constant.[2]

This constant of proportionality depends on which units are used for the other variables in the ideal gas law equation. Some common values for are:

This constant is closely related to Boltzmann's constant, (to get the ideal gas constant from Boltzmann's constant, multiply by Avogadro's number: ).