Term: light
https://doi.org/10.1351/goldbook.08264

Definition:
Electromagnetic radiation visible to the human eye.

Note: In general, spectroscopic usage, 'light' is synonymous with 'radiation' when the specific wavelength is not relevant.

Link: 
Related Term: electromagnetic radiation (http://doi.org/10.1351/goldbook.08242).

Source: PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 665 (https://doi.org/10.1515/pac-2019-0203)

Citation: 'light' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.08264

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.

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.