= Concentration blob
A region of size $\xi$ containing a typical correlated chain segment whose internal monomer concentration matches the bulk concentration. If it contains $g$ statistical units with isolated size law $\xi\sim bg^\nu$ and unit volume $v_0$, concentration matching gives $\phi\sim gv_0/\xi^3$. Eliminating $g$ gives $\xi\sim b(\phi b^3/v_0)^{-\nu/(3\nu-1)}$. Numerical prefactors and distinctions among scattering, osmotic and geometric correlation lengths require additional definitions.
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