The ratio of the quantity of the solvent to that of the other phase.
- Unless otherwise specified the phase ratio refers to the phase volume ratio.
- If other aspects of the phase ratio are employed viz. phase mass ratio, phase flow ratio, these should be specified.
PAC, 1993, 65, 2373 (Nomenclature for liquid-liquid distribution (solvent extraction) (IUPAC Recommendations 1993)) on page 2385