Title: energy flux density
Long Title: IUPAC Gold Book - energy flux density
DOI: 10.1351/goldbook.E02106
Status: current

Definition
For mono-directional radiation, the energy traversing in a time interval over a small area perpendicular to the direction of the energy flow, divided by that time interval and by that area.

Related Terms
- energy: https://goldbook.iupac.org//terms/view/E02101
- intensity: https://goldbook.iupac.org//terms/view/I03072
- radiation: https://goldbook.iupac.org//terms/view/R05048

Source
- PAC, 1994, 66, 2513. 'Nomenclature for radioanalytical chemistry (IUPAC Recommendations 1994)' on page 2519 (https://doi.org/10.1351/pac199466122513)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/E02106/html
- json: https://goldbook.iupac.org/terms/view/E02106/json
- xml: https://goldbook.iupac.org/terms/view/E02106/xml

Citation: Citation: 'energy flux density' 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.E02106
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: 2026-05-09T11:06:04+00:00