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Physical Properties of Popular Gases

 

 

 

Gas Argon Carbon Dioxide Helium Neon Nitrogen Oxygen
Atomic or Molecular Weight 39.948 44.01 4.0026 20.183 28.013 31.999
Normal Boiling Point (nbp) °F -302.6 -109.3* -452.1 -410.9 -320.4 -297.3
Freezing Point °F -308.9 -109.3 -415.5 -346 -361.8
Triple Point (tp) °F -308.9 -69.8 -415.5 -346 -361.8
psia 10 75.2 6.3 1.8 0.022
Critical Point °F -188.1 87.9 -450.3 -380 -232.5 -181.1
psia 710 1071 33.2 395 493 737
Density Gas, NTP lb/ft3 0.1034 0.1144 0.01034 0.05215 0.07245 0.08281
Gas, STP lb/ft3 0.1114 0.1234 0.01114 0.05618 0.07805 0.08921
Vapor, nbp lb/ft3 0.363 1.04 0.596 0.287 0.279
Liquid, nbp lb/ft3 86.98 63.36** 7.798 75.35 50.46 71.27
Specific Heat, Cp, Gas, NTP Btu/lb °F 0.125 0.2 1.25 0.246 0.247 0.22
Specific Heat Ratio, Cp/Cv, Gas, NTP 1.67 1.31 1.66 1.66 1.41 1.4
Heat of Vaporization, nbp Btu/lb 70.2 246.6* 8.72 37 85.7 91.7
Heat of Fusion, tp Btu/lb 12.7 85.6 7.1 11.1 6
* Denotes sublimation temperature at 1 atmosphere.
** Liquid density at 2 °F and 302 psig.

 

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