symbol: $g^{\prime}$
synonyms: hydrodynamic contraction factor, viscosity contraction factor
https://doi.org/10.1351/goldbook.12213
Ratio of the intrinsic viscosity of a branched molecule, \([\eta_{\rm{b}}]\), to that of an otherwise identical linear molecule, \([\eta_{\rm{l}}]\), of the same relative molecular mass in the same solvent at the same temperature, i.e., \(g^{\prime} = [\eta_{\rm{b}}]/[\eta_{\rm{l}}]\).
Note: The \(g^{\prime}\mbox{-}\rm{factor}\) is a quantity characterizing the effects of long-chain branches on the size of a branched molecule.
Compare: g-factor