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1 |
Name | HYDROGEN |
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2 |
Formula | H2 |
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3 |
CAS Number | 1333-74-0 |
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4 |
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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32 |
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) |
- |
