00609 IUPAC Gold Book - base quantity 10.1351/goldbook.B00609 B00609 current 1 One of the quantities that, in a system of quantities, are conventionally accepted as functionally independent of one another. In the SI, these are: length, mass, time, electric current, temperature, amount of substance, and luminous intensity. All other physical quantities (and units) are regarded as being derived from these base quantities (and base units). amount of substance https://goldbook.iupac.org//terms/view/A00297 base units https://goldbook.iupac.org//terms/view/B00610 electric current https://goldbook.iupac.org//terms/view/E01927 length https://goldbook.iupac.org//terms/view/L03498 luminous intensity https://goldbook.iupac.org//terms/view/L03647 mass https://goldbook.iupac.org//terms/view/M03709 temperature https://goldbook.iupac.org//terms/view/T06321 time https://goldbook.iupac.org//terms/view/T06375 PAC, 1986, 58, 1405. 'Recommendations for the presentation of thermodynamic and related data in biology (Recommendations 1985)' on page 1406 (https://doi.org/10.1351/pac198658101405) PAC, 1996, 68, 957. 'Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)' on page 963 (https://doi.org/10.1351/pac199668040957) https://goldbook.iupac.org/terms/view/B00609/html https://goldbook.iupac.org/terms/view/B00609/json https://goldbook.iupac.org/terms/view/B00609/plain Citation: 'base quantity' 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.B00609 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. 2026-06-12T04:29:44+00:00