| Molecular formula | H₂ |
| CAS Number | 1333-74-0 |
| UN Number | 1049 |
| Appearance | Colourless, flammable gas |
| Odour | Odourless |
| Density | 0.082 kg/m³ |
| Melting point | –259ºC |
| Boiling point | –253ºC |
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