https://doi.org/10.1351/goldbook.I02935
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 @[email protected] and \(T\) the @[email protected]). For an ideal gas the @[email protected], \(f\), of each @[email protected] B is equal to its @[email protected], \(p_{\text{B}}\), \(f_{\text{B}}=p_{\text{B}}=x_{\text{B}}\ p\), where \(x_{\text{B}}\) is the amount fraction of B.