 Critical-density compressibility of a cubic gas (source code)

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= Critical-density compressibility of a cubic gas

For the cubic-density model, $\kappa_T=(n\,\partial p/\partial n)^{-1}$ gives $\kappa_T(n_c,T)=1/[n_ck_B(T-T_c)]$. Divergence from above is a mean-field critical prediction. The negative value below $T_c$ signals an unstable homogeneous branch rather than an equilibrium negative compressibility.

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