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