ქიმიის ტერმინთა განმარტებითი ლექსიკონი

The ratio of a dimensional characteristic of a macromolecule in a given solvent at a given temperature to the same dimensional characteristic in the Θ state at the same temperature. The most frequently used expansion factors are: expansion factor of the mean-square end-to-end distance,

expansion factor of the radius of gyration

viscosity expansion factor

where [η] and [η]_Θ are the intrinsic viscosity in a given solvent and in the Θ  state at the same temperature, respectively. Expansion factors defined by different dimensional characteristics are not exactly equal, nor need they have a constant ratio as a function of relative molecular mass.