{"term":{"id":"03072","title":"intensity","longtitle":"IUPAC Gold Book - intensity","doi":"10.1351\/goldbook.I03072","code":"I03072","status":"current","definitions":[{"id":1,"text":"The traditional term for photon flux, fluence rate, irradiance or radiant power (radiant flux). In terms of an object exposed to radiation, the term should now be used only for qualitative descriptions.","links":[{"term":"fluence rate","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/P04635"},{"term":"irradiance","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/P04637"},{"term":"photon flux","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/P04636"},{"term":"radiant flux","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/R05044"},{"term":"radiant power","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/R05046"}],"sources":["PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2248 (https:\/\/doi.org\/10.1351\/pac199668122223)"],"seealso":["Green Book, 2nd ed., p. 31 (https:\/\/goldbook.iupac.org\/files\/pdf\/green_book_2ed.pdf)","Orange Book, 2nd ed., p. 228 (https:\/\/media.iupac.org\/publications\/analytical_compendium\/)","PAC, 1990, 62, 2167. 'Glossary of atmospheric chemistry terms (Recommendations 1990)' on page 2197 (https:\/\/doi.org\/10.1351\/pac199062112167)"]},{"id":2,"text":"The magnitude of a particular feature in a spectrum.","sources":["PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2248 (https:\/\/doi.org\/10.1351\/pac199668122223)"]}],"altoutputs":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/I03072\/html","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/I03072\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/I03072\/plain"},"citation":"Citation: 'intensity' 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.I03072","license":"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.","collection":"If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org .","disclaimer":"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.","accessed":"2026-07-23T13:15:41+00:00"}}