Quotient of quantities of the same kind for different components within the same system.
Source:
PAC, 1996, 68, 957
(Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations
1996))
on page 989
PAC, 1985, 57, 1299
(Review of plasma deposition applications: preparation of optical waveguides)
on page 1309