ratio

https://doi.org/10.1351/goldbook.R05157
Quotient of quantities of the same kind for different components within the same system.
Sources:
PAC, 1985, 57, 1299. (Review of plasma deposition applications: preparation of optical waveguides) on page 1309 [Terms] [Paper]
PAC, 1996, 68, 957. (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)) on page 989 [Terms] [Paper]