reduced viscosity

of a polymer
Synonym: viscosity number
https://doi.org/10.1351/goldbook.R05220
The ratio of the relative viscosity increment to the mass concentration of the polymer, c, i.e. η i c, where η i is the relative viscosity increment.
Notes:
  1. The unit must be specified; cm3 g-1 is recommended.
  2. This quantity is neither a @V06627@ nor a pure number. The term is to be looked on as a traditional name. Any replacement by consistent terminology would produce unnecessary confusion in the polymer literature. Synonymous with @V06627@ number.
Source:
Purple Book, 1st ed., p. 63 (http://old.iupac.org/publications/books/author/metanomski.html)