Fundamental physical constant, R = 8.314 472 15 J K-1 mol-1.
Sources:
CODATA 2006 (https://doi.org/10.1103/RevModPhys.80.633)
PAC, 1996, 68, 957. 'Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)' on page 974 (https://doi.org/10.1351/pac199668040957)