Sum of states

{
  "id": "MLC-T-CHM-011578",
  "term": "Sum of states",
  "field": "Chemistry",
  "definition": "The total number of accessible quantum states of a system, such as a molecule or a collection of molecules, at a specific energy. It is calculated by counting all possible states up to and including that energy level. This quantity, denoted as W(E), is distinct from the density of states, which represents the number of states per unit energy interval at a given energy.",
  "subject": "Physical and Biophysical Chemistry",
  "references": [
    "PAC, 1996, 68, 149. 'A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC Recommendations 1996)' on page 188 (https://doi.org/10.1351/pac199668010149)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/sum-of-states/"
}