Collision density

{
  "id": "MLC-T-CHM-002221",
  "term": "Collision density",
  "field": "Chemistry",
  "definition": "The number of molecular collisions occurring per unit volume per unit time within a gas or liquid. This quantity is directly proportional to the square of the number density of the molecules and to the average relative speed of the colliding particles. It is a fundamental parameter in kinetic theory for understanding reaction rates.",
  "subject": "Physical and Biophysical Chemistry",
  "see_also": [
    "collision frequency"
  ],
  "references": [
    "Green Book, 2nd ed., p. 56 (https://goldbook.iupac.org/files/pdf/green_book_2ed.pdf)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/collision-density/"
}