Oxygen | Nitrogen | Argon | Hydrogen | Carbon Dioxide | Helium

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Name HYDROGEN
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Formula H2
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CAS Number 1333-74-0
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Molecular Weight 2.016
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Melting point 13.95 K , -259.2 C , -434.56 F
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Boiling point @ 101.325 kPa (1 atm) 20.39 K , -252.76 C , -422.97 F
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Critical Temperature 33.18 K , -239.97 C , -399.95 F
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Critical Pressure 13.13 bar , 12.96 atm , 190.43 psia
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Critical Volume 64.15 cm3/mol
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Critical Density 0.0314 g/cm3
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Critical Compressibility Factor 0.305
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Acentric Factor -0.220
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Density of Liquid @ -250 C 0.067 g/cm3
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Coefficient of thermal Expansion of Liquid @ 25 C 0.0209 1/C
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Surface Tension @ -259 C 2.99 dynes/cm
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Density of Gas @ 1 atm and 70 F (21.1 C) 0.083 kg/m3 , 0.0052 lb/ft3
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Relative Density of Gas @ 1 atm and 70 F (Air =1) 0.07
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Enthalpy of Vaporization @ Boiling Point 228.17 kJ/kg , 98.11 BTU/lb
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Enthalpy of Fusion @ Melting Point 58.04 kJ/kg , 24.96 BTU/lb
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Heat Capacity of Gas @ 25 C , Constant Pressure (CP) 14.268 kJ/(kg K) , 3.41 BTU/(lb R)
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Heat Capacity of Gas @ 25 C , Constant Volume (CV) 10.144 kJ/(kg K) , 2.424 BTU/(lb R)
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Ratio of Heat Capacities for Gas , CP/CV 1.407
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Heat capacity of Liquid @ -253 C 9.457 kJ/(kg K) , 2.26 BTU/(lb R)
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Heat capacity of Solid @ -260 C 2.842 kJ/(kg K ) , 0.679 BTU/(lb R)
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Entropy of Gas @ 25 C 130.57 J/(mol K)
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Entropy of Formation of Gas @ 25 C 0 J/(mol K)
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Enthalpy of Formation of Gas @ 25 C 0 kJ/mol
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Gibbs Energy of Formation of Gas @ 25 C 0 kJ/mol
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Solubility Parameter 6.648 (J/cm3)^0.5
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Liquid Volume 28.604 cm3/mol
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Solubility in Water @ 25 C 1.53 parts per million (wt)
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Octanol-Water Partition Coefficient , log KOW
-
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Henry's Law Constant for Compound in Water @ 25 C 70832.1 atm/mol fraction
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Viscosity of Gas @ 25 C 88.05 micropoise
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Viscosity of Liquid @ -250 C 0.011 centipoise
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Thermal Conductivity of Gas @ 25 C 0.17064 watts/(m K)
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Thermal Conductivity of Liquid @ -250 C 0.1314 watts/(m K)
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Lower Explosion Limit in Air 4 vol %
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Upper Explosion Limit in Air 75 vol %
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Flash Point Temperature
-
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Autoignition Temperature 400 C , 752 F
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Enthalpy of Combustion @ 25 C (77 F) 119950.4 kJ/kg , 51578.7 BTU/lb
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Threshold Limit Value (ACGIH)
-
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Permissible Exposure Limit (OSHA)
-
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Recommended Exposure Limit (NIOSH)
-

 

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