relative density, \(d\)
Ratio of density to a reference density, usually the density of water at 4°C; in the older literature this is called specific gravity.
Green Book, 2nd ed., p. 12 (
PAC, 1990, 62, 2167. 'Glossary of atmospheric chemistry terms (Recommendations 1990)' on page 2210 (
See also:
PAC, 1996, 68, 957. 'Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)' on page 990 (