Term: mesopause https://doi.org/10.1351/goldbook.M03848 Definition: That region of the atmosphere between the mesosphere and the thermosphere at which the temperature is a minimum. Related Terms: 1) mesosphere (http://doi.org/10.1351/goldbook.M03855). 2) thermosphere (http://doi.org/10.1351/goldbook.T06338). Source: PAC, 1990, 62, 2167. 'Glossary of atmospheric chemistry terms (Recommendations 1990)' on page 2201 (https://doi.org/10.1351/pac199062112167) Citation: 'mesopause' 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.M03848 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.