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