Quantity | Value | Units | Value | Units |
Atomic number | 1 | |||
Atomic mass | 1.008(7) | g mole-1 | ||
Specific gravity | 0.07080 | g cm-3 | ||
Mean excitation energy | 21.8 | eV | ||
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 |
Pion collision length | 70.4 | g cm-2 | 994.4 | cm |
Pion interaction length | 80.3 | g cm-2 | 1134. | 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 ℏωp | 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 (Na D) | 1.112 |