Degree of association

{
  "id": "MLC-T-CHM-002937",
  "term": "Degree of association",
  "field": "Chemistry",
  "definition": "The number of surfactant ions in one micelle, also called the aggregation number, counted without regard to where the counterions sit. More generally, the term also denotes the fraction of molecules of a substance that are present as associated species such as dimers, a dimensionless value between 0 and 1. For many ionic surfactants the aggregation number lies between about 20 and 100.",
  "subject": "Physical and Biophysical Chemistry",
  "see_also": [
    "micelle",
    "surfactant"
  ],
  "references": [
    "PAC, 1972, 31, 577. 'Manual of Symbols and Terminology for Physicochemical Quantities and Units, Appendix II: Definitions, Terminology and Symbols in Colloid and Surface Chemistry' on page 612 (https://doi.org/10.1351/pac197231040577)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/degree-of-association/"
}