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Chemical, Physical and Thermal Properties of Hydrogen - H2

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Chemical, physical and thermal properties of Hydrogen - H2 :

Molecular Weight 2.016
Specific Gravity, air = 1 0.070
Specific Volume (ft3/lb, m3/kg) 194, 12.1
Density of liquid at atmospheric pressure (lb/ft3, kg/m3) 4.43, 71.0
Absolute Viscosity (lbm/ft s, centipoises) 6.05 10-6, 0.009
Sound velocity in gas (m/s) 1315
Specific Heat - cp - (Btu/lboF or cal/goC, J/kgK) 3.42, 14310
Specific Heat Ratio - cp/cv 1.405
Gas constant - R - (ft lb/lboR, J/kgoC) 767, 4126
Thermal Conductivity (Btu/hr ft oF, W/moC) 0.105, 0.182
Boiling Point - saturation pressure 14.7 psia and 760 mm Hg - (oF, oK) -423, 20.4
Latent Heat of Evaporation at boiling point (Btu/lb, J/kg) 192, 447000
Freezing or Melting Point  at 1 atm (oF, oC) -434.6, -259.1
Latent Heat of Fusion (Btu/lb, J/kg) 25.0, 58000
Critical Temperature (oF, oC) -399.8, -240.0
Critical Pressure (psia, MN/m2) 189, 1.30
Critical Volume (ft3/lb, m3/kg) 0.53, 0.033
Flammable yes
Heat of combustion (Btu/ft3, Btu/lb, kJ/kg) 320, 62050, 144000
  • values at 25oC (77oF, 298 K) and atmospheric pressure
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