ideal gas

Gas which obeys the equation of state $p V = n R T$ (the ideal gas law; $p$ is the pressure, $V$ the volume, $n$ the amount of molecules, $R$ the gas constant and $T$ the thermodynamic temperature). For an ideal gas the fugacity, $f$ , of each constituentB is equal to its partial pressure, $p B$ , $f B = p B = x B p$ , where $x B$ is the amount fraction of B.

Source:

Physical Chemistry Division, unpublished