Virial coefficients of the van der Waals gas
= Virial coefficients of the van der Waals gas
{title2=$B_2=b-a/(k_BT),\quad B_j=b^{j-1}\ (j\geq3)$}
Expanding $p=nk_BT/(1-nb)-an^2$ at $nb\ll1$ gives the <second virial coefficient> $B_2=b-a/(k_BT)$ and the displayed higher density-series coefficients. These are the <Van der Waals gas> predictions, not exact coefficients for every fluid. The vanishing of $B_2$ at the <Boyle temperature> removes only the leading density correction.