virial coefficients

https://doi.org/10.1351/goldbook.V06625
Coefficients (B, C, ...) in the virial equation of state for a real gas p V m = R T ( 1 + B V m + C V m where p is the pressure, V m the molar volume, R the gas constant and T the thermodynamic temperature.
Source:
Green Book, 2nd ed., p. 49 (https://dev.goldbook.iupac.org/files/pdf/green_book_2ed.pdf)