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Specialty Gases Reference Guide

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Technical Data Miscellaneous Physical Constants Miscellaneous Physical Constants Numerical Constant Value Avogadro’s Number Gas-Law Constant R 6.022045 x 1023 1.98719 1.98719 82.0568 0.0820568 10.7314 0.730228 8.314510 8314.5100 0.0831451 Volume of Ideal Gas Conditions 0 °C, 1 atm. 15 °C, 1 atm. 70 °F, 1 atm. NTP (U.S.) STP (U.S.) V ft3 T °K °R H 10 °R L °K °R cm3 °K n mol lb-mol mol lb-mol mol lb-mol mol lb-mol mol lb-mol mol lb-mol Units Molecules/g-mole cal/(g-mole) (°K) Btu/(lb-mole) (°R) (cm3 ) (lb)/(in2 ) (atm)/(g-mole) (°K) ) (atm)/(lb-mole) (°R) (kPa) (L)/(g-mol) (°K) (Pa) (L)/(g-mol) (°K) (bar) (L)/(g-mol) (°K) (liter) (atm)/(g-mole) (°K) (ft3 (ft3 ) (lb-mole) (°R) Volume, L 22.414 23.645 24.146 70 °F, 1 atm. 0 °C, 1 atm. atm 0.00290 1.31 0.00161 0.730 82.05 37,200 45.6 20,700 0.08205 37.2 0.0456 20.7 psi 0.0426 19.31 0.02366 10.73 1,206 547,000 670 304,000 1.206 547 0.670 304 mm Hg 2.20 999 1.22 555 62,400 2.83E+07 34,600 1.57E+07 62.4 28,300 34.6 15,700 This table gives the appropriate value of R for use in the ideal gas equation, PV=nRT, when the variable are expressed in other units. * Unless otherwise noted mol = g-mol cm Hg 0.220 99.9 0.122 55.5 6,240 2.83E+06 3,460 1.57E+06 6.24 2,830 3.46 1,570 in Hg 0.0867 39.3 0.0482 21.8 2,450 1.11E+06 1,360 619,000 2.45 1,113 1.36 619 in H2 1.18 535 O ft H2 O 0.0982 44.6 0.655 297 33,400 1.51E+07 18,500 8.41E+06 33.4 15,140 18.5 8,410 0.0546 24.8 2,780 1.26E+06 1,550 701,000 2.78 1,262 1.55 701 Volume, m3 0.022414 0.023645 0.024146 1-877-PRAXAIR www.praxair.com/specialtygases

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