Virial coefficient

The Virial coefficients are a set of coefficients in the virial equation of state, which describes the relationship between pressure, volume, and temperature for a real gas. The virial equation is often expressed as an expansion in terms of the density of the gas: \[ \frac{P}{kT} = \rho + B(T)\rho^2 + C(T)\rho^3 + \ldots \] Here: - \( P \) is the pressure of the gas.