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para-Hydrogen
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para-Hydrogen
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p-H2
para-Hydrogen

Physical Properties

Under solid (grey), liquid (blue) and vapor states (white) along the equilibrium curves

  • General properties
  • Solid phase
  • Liquid Phase
  • Gas Phase
(P)
log(P)
Download
  • Molecular weight
    2.016
    g/mol
  • Content in air
    /

Critical Point

  • Temperature
    - 240.1
    °C
    - 400.18 °F 33.05 K
  • Pressure
    12.858
    bar
    1.2858E6 pa 186.4894 lbf/in2 12.6899 Atm 1285.8 Kpa 9644.3198 mmHg
  • Density
    31.324
    kg/m³
    1.9555 lb/ft³

Triple Point

  • Temperature
    - 259.35
    °C
    - 434.83 °F 13.8 K
  • Pressure
    7.0077E-2
    bar
    7007.73 pa 1.0164 lbf/in2 6.9161E-2 Atm 7.0077 Kpa 52.5624 mmHg
Pressure 1.013 bar
  • Melting point
    - 259.35
    °C
    - 434.83 °F 13.8 K
  • Latent heat of fusion (at melting point)
    58.287
    kJ/kg
    25.0757 Btu/lb 13.9309 kcal/kg
  • Solid density
    /
Pressure 1.013 bar
  • Liquid density
    70.832
    kg/m³
    4.4219 lb/ft³
  • Boiling point
    - 252.88
    °C
    - 423.184 °F 20.27 K
  • Latent heat of vaporization (at boiling point)
    446.06
    kJ/kg
    191.9 Btu/lb 106.6109 kcal/kg
Pressure1.013barTemperature
  • Compressibility factor Z
    1.0006
    1.0006
    1.0006
  • Cp/Cv ratio γ
    1.3775
    1.382
    1.3845
  • Dynamic viscosity
    8.3969E-5
    Po
    8.3969 µPa.s 8.3969E-6 PA.S 5.6425E-6 lb/ft/s
    8.7098E-5
    Po
    8.7098 µPa.s 8.7098E-6 PA.S 5.8527E-6 lb/ft/s
    8.9154E-5
    Po
    8.9154 µPa.s 8.9154E-6 PA.S 5.9909E-6 lb/ft/s
  • Gas density at boiling point
    1.338
    kg/m³
    8.3528E-2 lb/ft³
    1.338
    kg/m³
    8.3528E-2 lb/ft³
    1.338
    kg/m³
    8.3528E-2 lb/ft³
  • Gas density
    8.99E-2
    kg/m³
    5.6123E-3 lb/ft³
    8.52E-2
    kg/m³
    5.3189E-3 lb/ft³
    8.23E-2
    kg/m³
    5.1378E-3 lb/ft³
  • Heat capacity at constant pressure Cp
    15.0608
    kJ/(kg.K)
    3.5996 BTU/lb∙°F 1.5061E4 J/kg∙K 3.5996 kcal/kg∙K
    14.9298
    kJ/(kg.K)
    3.5683 BTU/lb∙°F 1.493E4 J/kg∙K 3.5683 kcal/kg∙K
    14.8574
    kJ/(kg.K)
    3.551 BTU/lb∙°F 1.4857E4 J/kg∙K 3.551 kcal/kg∙K
  • Heat capacity at constant volume Cv
    10.9341
    kJ/(kg.K)
    2.6133 BTU/lb∙°F 1.0934E4 J/kg∙K 2.6133 kcal/kg∙K
    10.8031
    kJ/(kg.K)
    2.582 BTU/lb∙°F 1.0803E4 J/kg∙K 2.582 kcal/kg∙K
    10.7312
    kJ/(kg.K)
    2.5648 BTU/lb∙°F 1.0731E4 J/kg∙K 2.5648 kcal/kg∙K
  • Liquid (at boiling point)/gas equivalent
    788.22
    mol/mol
    831.49
    mol/mol
    860.34
    mol/mol
  • Solubility in water
    /
    /
    /
  • Specific gravity
    0.07
    0.07
    0.07
  • Specific volume
    11.128
    m³/kg
    178.2533 ft³/lb
    11.739
    m³/kg
    188.0406 ft³/lb
    12.146
    m³/kg
    194.5601 ft³/lb
  • Thermal conductivity
    182.44
    mW/m∙K
    1.0548E-1 Btu/ft/h/°F 1.5698 cal/hour∙cm∙°C 4.3604E-4 cal/s∙cm∙°C 1.8244E-1 W/(m∙K)
    187.89
    mW/m∙K
    1.0863E-1 Btu/ft/h/°F 1.6166 cal/hour∙cm∙°C 4.4907E-4 cal/s∙cm∙°C 1.8789E-1 W/(m∙K)
    191.58
    mW/m∙K
    1.1077E-1 Btu/ft/h/°F 1.6484 cal/hour∙cm∙°C 4.5789E-4 cal/s∙cm∙°C 1.9158E-1 W/(m∙K)
  • Vapor pressure
    /
    /
    /
p-H2
para-Hydrogen

Liquid / Gas Volumes

Calculate a liquid or gas volume or a mass

Liquid Phase

At boiling point at 1.013 bar

m3(Volume)
kg(Mass)

Gas Phase

at 1.013 bar and boiling point

m3(Volume)
kg(Mass)
p-H2
para-Hydrogen

Applications

Examples of uses of this molecule in Industry and Healthcare

p-H2
para-Hydrogen

Safety

Information to safely use this molecule

  • Major hazards
  • Material compatibility

Autoignition Temperature in Air at Patm and Flammability Limits in Air at Patm and 293.15 K (except if the temperature is indicated)

  • Europe (according to EN1839 for Limits and EN 14522 for autoignition temperature)

    • Auto-ignition temperature
      560
      °C
      1040 °F 833.15 K
    • Flash point
      /
    • Lower flammability limit
      4
      vol/%
      4.E4 ppm 4.E4 ppm 0.04 vol/vol
    • Upper flammability limit
      77
      vol/%
      7.7E5 ppm 7.7E5 ppm 0.77 vol/vol
  • US (according to NFPA for Limits and ASTM E659 for autoignition temperature)

    • Auto-ignition temperature
      500
      °C
      932 °F 773.15 K
    • Flash point
      /
    • Lower flammability limit
      4
      vol/%
      4.E4 ppm 4.E4 ppm 0.04 vol/vol
    • Upper flammability limit
      75
      vol/%
      7.5E5 ppm 7.5E5 ppm 0.75 vol/vol

Metals

  • Aluminium
    no data
  • Brass
    no data
  • Monel
    no data
  • Copper
    no data
  • Ferritic Steel
    no data
  • Stainless steel
    no data
  • Zinc
    no data
  • Titanium
    no data

Plastics

  • Polytetrafluoroethylene
    no data
  • Polychlorotrifluoroethylene
    no data
  • Polyvinylidene fluoride
    no data
  • Polyvinyl chloride
    no data
  • Ethylene tetrafluoroethylene
    no data
  • Polycarbonate
    no data
  • Polyamide
    no data
  • Polypropylene
    no data

Elastomers

  • Buthyl (isobutene- isoprene) rubber
    no data
  • Nitrile rubber
    no data
  • Chloroprene
    no data
  • Chlorofluorocarbons
    no data
  • Silicon
    no data
  • Perfluoroelastomers
    no data
  • Fluoroelastomers
    no data
  • Nitrile rubber
    no data
  • Neoprene
    no data
  • Polyurethane
    no data
  • Ethylene-Propylene
    no data

Lubricants

  • Hydrocarbon based lubricant
    no data
  • Fluorocarbon based lubricant
    no data

Materials compatibility

Recommendations : Air Liquide has gathered data on the compatibility of gases with materials to assist you in evaluating which materials to use for a gas system. Although the information has been compiled from what Air Liquide believes are reliable sources (International Standards: Compatibility of cylinder and valve materials with gas content; Part 1- Metallic materials: ISO11114-1 (March 2012), Part 2 - Non-metallic materials: ISO11114-2 (April 2013), it must be used with extreme caution and engineering judgement. No raw data such as these can cover all conditions of concentration, temperature, humidity, impurities and aeration. It is therefore recommended that this table is only used to identify possible materials for applications at high pressure and ambient temperature. Extensive investigation and testing under the specific conditions of use need to be carried out to validate a material selection for a given application. Contact the regional Air Liquide team for expertise service.

p-H2
para-Hydrogen

Learn More

General information