\(S.T.P.\) એે બધા જ વાયુના એક મોલનું \(V = 22.4\, litre = 22.4 \times 10^{-3} m^3\)
\(P = 760 \,mm\, of\, Hg = 760 \times 10^{-3} \times 13.6 \times 10^3 \times 9.80 N m^{-2}\,\,\, T = 273 K\)
\(\therefore \,\,R\,\, = \,\,\frac{{760\,\, \times \,\,{{10}^{ - 3}} \times \,\,13.6\,\, \times \,\,{{10}^3} \times \,\,9.80\,\, \times \,\,22.4\,\,\, \times \,\,\,{{10}^{ - 3}}}}{{273}}\,\,\, = \,\,\,8.31\,\,J\,\,mo{l^{ - 1}}\,\,{K^{ - 1}}\)
( $R =2 cal mole { }^{-1} K ^{-1}$ લો.)