## Wikipedia - Efekty steryczne (pl) steric factor

in polymers
https://doi.org/10.1351/goldbook.S05999
The ratio, $$\sigma$$, of the @[email protected] of a polymer chain with unperturbed dimensions, $$< r^{2} >_{0}^{1/2}$$, to that of a @[email protected] with the same structure, $$< r^{2} >_{0,f}^{1/2}$$, i.e. $$\sqrt{\frac{< r^{2} >_{0}}{< r^{2} >_{0,f}}}$$, in the limit of infinite @[email protected] The @[email protected] reflects the effect of hindrance to free rotation.
Source:
Purple Book, 1st ed., p. 50 [Terms] [Book]