The equation describing the dependence of the @I03140@ of a polymer on its @R05271@ (@M04000@) and having the form: \[[\eta] = K\cdot M_{\text{r}}^{a}\] where \([\eta]\) is the intrinsic @V06627@, \(K\) and \(a\) are constants the values of which depend on the nature of the polymer and solvent as well as on temperature and \(M_{\text{r}}\) is usually one of the @R05271@ averages.
  1. The use of this equation with the @R05271@ (@M04000@) is recommended, rather than with molar mass (which has the dimension of mass divided by @A00297@), since in the latter case the constant \(K\) assumes awkward and @V06600@ dimensions owing to the fractional and @V06600@ nature of the exponent \(a\).
  2. Kuhn and Sakurada have also made important contributions and their names are sometimes included, as, for example, in the Kuhn–Mark–Houwink–Sakurada equation.
Purple Book, 1st ed., p. 64 [Terms] [Book]