12743 IUPAC Gold Book - amorphous state 10.1351/goldbook.12743 12743 current 1 State of matter characterised by the absence of long-range molecular order. Some degree of local order about \(\pu{1 nm}\) in length may exist in the amorphous state. In the absence of stress, the structure and properties of the amorphous state are generally isotropic at a large-enough scale, as in liquids. PAC, 2013, 85, 1017. 'Glossary of terms relating to thermal and thermomechanical properties of polymers (IUPAC Recommendations 2013)' on page 1018 (https://doi.org/10.1351/PAC-REC-12-03-02) https://goldbook.iupac.org/terms/view/12743/html https://goldbook.iupac.org/terms/view/12743/json https://goldbook.iupac.org/terms/view/12743/plain Citation: 'amorphous state' 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.12743 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. If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . 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. 2026-07-15T03:09:38+00:00