Quantity | Value | Units | Value | Units | |
Atomic number | 18 | ||||
Atomic mass | 39.948(1) | g mole-1 | |||
Specific gravity (20° C, 1 atm) | 1.662E-03 | g cm-3 | |||
Mean excitation energy | 188.0 | eV | |||
Minimum ionization | 1.519 | MeV g-1cm2 | 2.525E-03 | MeV cm-1 | |
Nuclear collision length | 75.7 | g cm-2 | 4.557E+04 | cm | |
Nuclear interaction length | 119.7 | g cm-2 | 7.204E+04 | cm | |
Pion collision length | 101.3 | g cm-2 | 6.097E+04 | cm | |
Pion interaction length | 149.0 | g cm-2 | 8.964E+04 | cm | |
Radiation length | 19.55 | g cm-2 | 1.176E+04 | cm | |
Critical energy | 38.03 | MeV (for e-) | 37.06 | MeV (for e+) | |
Molière radius | 10.90 | g cm-2 | 6559. | cm | |
Plasma energy ℏωp | 0.79 | eV | |||
Muon critical energy | 572. | GeV | |||
Melting point | 83.81 | K | -189.3 | C | |
Boiling point @ 1 atm | 87.26 | K | -185.9 | C | |
Index of refraction (0° C, 1 atm, Na D) | 281. | (n-1)x106 |