excluded volume of a macromolecule

in polymers
https://doi.org/10.1351/goldbook.E02259
The volume from which a macromolecule in a @[email protected] of a macromolecule effectively excludes all other macromolecules. The excluded volume of a macromolecule depends on the Gibbs and Helmholtz energies of mixing of solvent and polymer, i.e. on the thermodynamic quality of the solvent, and is not a measure of the geometrical volume of that macromolecule.
Source:
Purple Book, 1st ed., p. 58 [Terms] [Book]