https://doi.org/10.1351/goldbook.G02579
Fundamental physical constant, R=8.314472(15) JK1mol1.
Sources:
CODATA 2006 [Terms] [Book]
PAC, 1996, 68, 957. (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)) on page 974 [Terms] [Paper]