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Cryogenic Fluids and Liquefied Gas Properties

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Cryogenic services involves the handling of liquefied gases like helium, hydrogen, methane, nitrogen, oxygen and fluorine in temperatures between -150 oF to -450 oF.

The "cryogenic" properties of these materials can be summarized to:

Gas Helium
- He -
- H2 -
- CH4 -
- N2 -
- O2 -
- F2 -
Density at Normal Pressure and Temperature - NPT
0.0103 0.0052 0.0415 0.0724 0.0827 0.0982
Boiling point at 1 atm
-452.1 -423.2 -258.2 -320.4 -297.4 -306.6
Vapor density at boiling point
1.06 0.084 0.111 0.288 0.296
Liquid density at boiling point
7.62 4.37 26.46 50.41 71.27 94.2
Heat of vaporization
8.8 193 219.2 85.2 91.7 74.1
Critical Temperature
-450.3 -400.3 -116.5 -232.8 -181.1 -200.2
Critical Pressure
33.2 187.7 673.1 492.3 736.9 808.3

NTP - Normal Temperature and Pressure: 14.696 psia 70 oF.

  • 1 lb/ft3 = 16.018 kg/m3
  • 1 psi = 6894.8 Pa
  • 1 Btu/lb = 2326 J/kg
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