Tammann’s 2/3rd rule

{
  "id": "MLC-T-CHM-011806",
  "term": "Tammann’s 2/3rd rule",
  "field": "Chemistry",
  "definition": "An empirical observation stating that the glass transition temperature of a polymer is approximately two-thirds of its melting temperature when both are expressed in Kelvin. This rule provides a quick estimate of the glass transition temperature for many polymers. It is a generalization and not a strict physical law, with deviations observed for specific polymer types.",
  "subject": "Polymer",
  "see_also": [
    "melting temperature"
  ],
  "references": [
    "PAC, 2013, 85, 1017. 'Glossary of terms relating to thermal and thermomechanical properties of polymers (IUPAC Recommendations 2013)' on page 1039 (https://doi.org/10.1351/PAC-REC-12-03-02)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/tammanns-2-3rd-rule/"
}