Perrin equation

{
  "id": "MLC-T-CHM-008681",
  "term": "Perrin equation",
  "field": "Chemistry",
  "definition": "An equation that gives the rotational diffusion coefficient of an isolated dissolved molecule or dispersed particle as kT divided by 6 pi times the solvent viscosity times the cube of an equivalent hydrodynamic radius for rotation. Rotational diffusion is therefore far more sensitive to size than translational diffusion, where the Stokes-Einstein relation contains the radius only to the first power.",
  "subject": "Polymer",
  "see_also": [
    "equivalent hydrodynamic radius"
  ],
  "references": [
    "PAC, 2015, 87, 71. 'Definitions of terms relating to individual macromolecules, macromolecular assemblies, polymer solutions, and amorphous bulk polymers (IUPAC Recommendations 2014)' on page 103 (https://doi.org/10.1515/pac-2013-0201)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/perrin-equation/"
}