Title: fossil fuel Long Title: IUPAC Gold Book - fossil fuel DOI: 10.1351/goldbook.F02490 Status: current Definition A fuel such as coal, oil and natural gas which has formed over many years through the decomposition of deposited vegetation which was under extreme pressure of an overburden of earth. Related Term - decomposition: https://goldbook.iupac.org/terms/view/D01547 Source - PAC, 1990, 62, 2167. 'Glossary of atmospheric chemistry terms (Recommendations 1990)' on page 2190 (https://doi.org/10.1351/pac199062112167) Other Outputs - html: https://goldbook.iupac.org/terms/view/F02490/html - json: https://goldbook.iupac.org/terms/view/F02490/json - xml: https://goldbook.iupac.org/terms/view/F02490/xml Citation: Citation: 'fossil fuel' 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.F02490 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: 2026-07-01T00:05:25+00:00