05282 IUPAC Gold Book - relative viscosity 10.1351/goldbook.R05282 R05282 current synonym: viscosity ratio 1 The ratio of the viscosity of the solution, \(\eta \), to the viscosity of the solvent, \(\eta _{\rm{s}}\), i.e. \(\eta _{\rm{r}} = \frac{\eta}{\eta _{\rm{s}}}\). Synonymous with viscosity ratio. viscosity https://goldbook.iupac.org//terms/view/V06627 Purple Book, 1st ed., p. 62 (http://old.iupac.org/publications/books/author/metanomski.html) https://goldbook.iupac.org/terms/view/R05282/html https://goldbook.iupac.org/terms/view/R05282/json https://goldbook.iupac.org/terms/view/R05282/plain Citation: 'relative viscosity' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.R05282 The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using. 2026-06-28T16:27:43+00:00