00947 IUPAC Gold Book - chain axis 10.1351/goldbook.C00947 C00947 current 1 The straight line parallel to the direction of chain extension, connecting the centres of mass of successive blocks of chain units, each of which is contained within an identity period. Purple Book, 1st ed., p. 77 (http://old.iupac.org/publications/books/author/metanomski.html) https://goldbook.iupac.org/terms/view/C00947/html https://goldbook.iupac.org/terms/view/C00947/json https://goldbook.iupac.org/terms/view/C00947/plain Citation: 'chain axis' 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.C00947 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. 2026-06-21T21:37:43+00:00