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As part of an equation of state calculator that I am working on, I have to handle a virial expansion for the equation of state. As such I have to solve for the virial coefficent, $B(T)$, which is defined as
$$B(T)=-2\pi N_a\int_0^{\infty}(ⅇ^{\frac{-\phi}{\kappa_b T}}-1)R^2dR$$
Where $\phi$ is...