A coefficient connecting the intrinsic viscosity, the radius of gyration and the molar mass of a chain macromolecule, according to the equation: \[\rm{[}\eta \rm{]} = \frac{\mathit{\Phi }\ 6^{3/2}\ ( < s^{2} > )^{3/2}}{M}\] where \(\rm{[}\eta \rm{]}\) is the intrinsic viscosity, \(s\) is the radius of gyration and \(M\) is the molar mass. The viscosity function is often referred to as the Flory constant.