https://doi.org/10.1351/goldbook.V06625
Coefficients (\(B\rm{,}C\rm{,}\,...\)) in the virial equation of state for a real gas \(p\ V_{\rm{m}}=R\ T\ (1+\frac{B}{V_{\rm{m}}}+\frac{C}{V_{\rm{m}}^{2}}+\,...)\) where \(p\) is the pressure, \(V_{\rm{m}}\) the molar volume, \(R\) the gas constant and \(T\) the thermodynamic temperature.