Critical nucleus radius ($r^{\ast }=-2\gamma /\Delta g_V$)

In the spherical capillarity approximation, the nonzero maximum of $\Delta G=4\pi r^2\gamma +(4\pi /3)r^3\Delta g_V$ lies at $r^{\ast }=-2\gamma /\Delta g_V$ when $\Delta g_V<0$. Smaller nuclei tend to shrink and larger ones tend to grow. Surface anisotropy and molecular-scale structure limit the approximation.