| Quantity | Value | Units | Value | Units |
| Atomic number | 1 | |||
| Atomic mass | 1.00794(7) | g mole-1 | ||
| Specific gravity | 0.0708 | g cm-3 | ||
| Minimum ionization | 4.034 | MeV g-1cm2 | 0.2856 | MeV cm-1 |
| Nuclear collision length | 42.8 | g cm-2 | 605.1 | cm |
| Nuclear interaction length | 52.0 | g cm-2 | 734.6 | cm |
| Radiation length | 63.04 | g cm-2 | 890.4 | cm |
| Critical energy | 278.02 | MeV (for e-) | 271.50 | MeV (for e+) |
| Molière radius | 4.81 | g cm-2 | 67.92 | cm |
| Plasma energy |
7.64 | eV | ||
| Muon critical energy | 3102. | GeV | ||
| Melting point | 13.81 | K | -259.3 | C |
| Boiling point @ 1 atm | 20.28 | K | -252.9 | C |
| Index of refraction (@ STP, Na D) | 1.11 |