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Helium

He PHYSICAL PROPERTIES
  US Units SI Units
Chemical formula He He
Molecular weight 4.00 4.00
Density of the gas at 70F(21C)and 1atm. 0.0103 lb /ft3 0.165 kg/m3
Specific gravity of the gas at 70F (21C)and 1 atm (air=1) 0.138 0.138
Specific volume of the gas at 70F (21C) and 1 atm 97.09 ft3 6.061 m3/kg
Density of the liquid at boiling point and 1 atm 7.802 lb/ft3 124.98 kg/m3
Critical temperature -450.3F -267.9C
Critical pressure 33.0 psia 227 KPa,abs
Critical density 4.347 lb/ft3 69.64 kg/m3
Boiling point at 1 atm -452.1F -268.9C
Solubility in water vol/vol at 32F(0C) 0.0094 0.0094


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