## Huggins equation

https://doi.org/10.1351/goldbook.H02869
The equation describing the dependence of the reduced viscosity, η i c, on the mass concentration of a polymer, c, for dilute polymer solutions of the form: $\frac{\eta _{\text{i}}}{c} = \left[\eta \right]+k_{\text{H}}\ \left[\eta \right]^{2}\ c$ where kH is the Huggins coefficient and [η] is the intrinsic viscosity.
Source:
Purple Book, 1st ed., p. 63 (http://old.iupac.org/publications/books/author/metanomski.html)