Quasi-equilibrium

{
  "id": "MLC-T-CHM-009772",
  "term": "Quasi-equilibrium",
  "field": "Chemistry",
  "definition": "A state in a chemical system where certain processes are in equilibrium, while others are not, or where a system is very close to equilibrium but still undergoing slow net change. This concept is often applied in transition state theory, where the activated complex is assumed to be in quasi-equilibrium with the reactants. It implies a separation of timescales for different processes.",
  "subject": "Physical and Biophysical Chemistry",
  "see_also": [
    "activated complex",
    "transition state theory"
  ],
  "references": [
    "PAC, 1996, 68, 149. 'A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC Recommendations 1996)' on page 179 (https://doi.org/10.1351/pac199668010149)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/quasi-equilibrium/"
}