reflection coefficient

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re·flec·tion co·ef·fi·cient (σ),

a measure of the relative permeability of a particular membrane to a particular solute; calculated as the ratio of observed osmotic pressure to that calculated from van't Hoff law; also equal to 1 minus the ratio of the effective pore areas available to solute and to solvent.

re·flec·tion co·ef·fi·cient

(σ) (rĕ-flek'shŭn kō'ĕ-fish'ĕnt)
A measure of the relative permeability of a particular membrane to a particular solute; calculated as the ratio of observed osmotic pressure to that calculated from van't Hoff law.