Quantity | Value | Units | Value | Units | |
Atomic number | 1 | ||||
Atomic mass | 1.008(7) | g mole-1 | |||
Specific gravity (20° C, 1 atm) | 8.376E-05 | g cm-3 | |||
Mean excitation energy | 19.2 | eV | |||
Minimum ionization | 4.103 | MeV g-1cm2 | 3.437E-04 | MeV cm-1 | |
Nuclear collision length | 42.8 | g cm-2 | 5.115E+05 | cm | |
Nuclear interaction length | 52.0 | g cm-2 | 6.209E+05 | cm | |
Pion collision length | 70.4 | g cm-2 | 8.406E+05 | cm | |
Pion interaction length | 80.3 | g cm-2 | 9.583E+05 | cm | |
Radiation length | 63.04 | g cm-2 | 7.527E+05 | cm | |
Critical energy | 344.80 | MeV (for e-) | 338.33 | MeV (for e+) | |
Molière radius | 3.88 | g cm-2 | 4.629E+04 | cm | |
Plasma energy ℏωp | 0.26 | eV | |||
Muon critical energy | 3611. | GeV | |||
Melting point | 13.81 | K | -259.3 | C | |
Boiling point @ 1 atm | 20.28 | K | -252.9 | C | |
Index of refraction (0° C, 1 atm, Na D) | 132. | (n-1)x106 |