Expansion factor

{
  "id": "MLC-T-CHM-004222",
  "term": "Expansion factor",
  "field": "Chemistry",
  "definition": "A dimensionless ratio comparing the size of a polymer coil in a particular solvent with its size in the theta state at the same temperature. The common forms use the end-to-end distance or the radius of gyration, each as the square root of the ratio of its mean-square values, plus a viscosity form that takes the cube root of the intrinsic viscosity ratio. It equals 1 in a theta solvent and exceeds 1 in a good solvent.",
  "subject": "Polymer",
  "see_also": [
    "radius of gyration",
    "relative molecular mass"
  ],
  "references": [
    "Purple Book, 1st ed., p. 59 (http://old.iupac.org/publications/books/author/metanomski.html)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/expansion-factor/"
}