Term: clearing point https://doi.org/10.1351/goldbook.CT06857 Definition: The temperature at which the transition between the mesophase with the highest temperature range and the isotropic phase occurs. Related Terms: 1) mesophase (http://doi.org/10.1351/goldbook.M03849). 2) isotropic (http://doi.org/10.1351/goldbook.I03353). Source: PAC, 2002, 74, 493. 'Definitions of basic terms relating to polymer liquid crystals (IUPAC Recommendations 2001)' on page 496 (https://doi.org/10.1351/pac200274030493) Citation: 'clearing point' 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.CT06857 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.