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Hydrogen

H2 PHYSICAL PROPERTIES
  US Units SI Units
Chemical formula H2 H2
Molecular weight 2.016 2.016
Density of the gas at 70F (21.1C) and 1 atm. 0.00521 lb /ft3 0.08342 kg/m3
Specific gravity of the gas at 32F (0C)and 1 atm (air=1) 0.06960 0.06960
Specific volume of the gas at 70F (21.1C) and 1 atm 192.0 lb/ ft3 11.99 m3/kg
Melting point at 1 atm -434.55F -252.19C
Critical temperature 399.93F -239.96C
Critical pressure 190.8 psia 1316 KPa,abs
Critical density 1.88 lb/ft3 30.12 kg/m3
Boiling point at 1 atm -423.0.F -252.8C
Solubility in water vol/vol at 60F (15.6C) 0.019 0.019

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