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Cryogenic Fluids - or Liquefied Gas Properties

Cryogenic properties as density, boiling points and heat of evaporation for fluids like hydrogen, methane, oxygen, nitrogen, fluorine and helium

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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 -
Hydrogen
- H2 -
Methane
- CH4 -
Nitrogen
- N2 -
Oxygen
- O2 -
Fluorine
- F2 -
Density at Normal Pressure and Temperature - NPT
(lb/ft3)
0.0103 0.0052 0.0415 0.0724 0.0827 0.0982
Boiling point at 1 atm
(oF)
-452.1 -423.2 -258.2 -320.4 -297.4 -306.6
Vapor density at boiling point
(lb/ft3)
1.06 0.084 0.111 0.288 0.296
Liquid density at boiling point
(lb/ft3)
7.62 4.37 26.46 50.41 71.27 94.2
Heat of vaporization
(Btu/lb)
8.8 193 219.2 85.2 91.7 74.1
Critical Temperature
(oF)
-450.3 -400.3 -116.5 -232.8 -181.1 -200.2
Critical Pressure
(psia)
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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