06489 IUPAC Gold Book - transport number 10.1351/goldbook.T06489 T06489 current quantity 1 Of ions $\ce{B}$, the current density due to ions $\ce{B}$ divided by the sum of current densities of all the ions in the electrolyte. ISO recommends the name current fraction of ions $\ce{B}$. current density https://goldbook.iupac.org//terms/view/C01452 Green Book, 2nd ed., p. 60 (https://goldbook.iupac.org/files/pdf/green_book_2ed.pdf) https://goldbook.iupac.org/terms/view/T06489/html https://goldbook.iupac.org/terms/view/T06489/json https://goldbook.iupac.org/terms/view/T06489/plain Citation: 'transport number' 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.T06489 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. 2026-05-08T10:45:50+00:00