https://doi.org/10.1351/goldbook.E02270
The ratio of a dimensional characteristic of a macromolecule in a given solvent at a given temperature to the same dimensional characteristic in the state at the same temperature. The most frequently used expansion factors are: expansion factor of the mean-square end-to-end distance, ; expansion factor of the ; where and are the intrinsic state at the same temperature, respectively. Expansion factors defined by different dimensional characteristics are not exactly equal, nor need they have a constant ratio as a function of
radius of gyration
viscosity
expansion factor viscosity
in a given solvent and in the relative molecular mass
.