Quantity | Value | Units | Value | Units |
Atomic number | 18 | |||
Atomic mass | 39.948(1) | g mole-1 | ||
Specific gravity | 1.396 | g cm-3 | ||
Mean excitation energy | 188.0 | eV | ||
Minimum ionization | 1.508 | MeV g-1cm2 | 2.105 | MeV cm-1 |
Nuclear collision length | 75.7 | g cm-2 | 54.25 | cm |
Nuclear interaction length | 119.7 | g cm-2 | 85.77 | cm |
Pion collision length | 101.3 | g cm-2 | 72.58 | cm |
Pion interaction length | 149.0 | g cm-2 | 106.7 | cm |
Radiation length | 19.55 | g cm-2 | 14.00 | cm |
Critical energy | 32.84 | MeV (for e-) | 31.91 | MeV (for e+) |
Molière radius | 12.62 | g cm-2 | 9.043 | cm |
Plasma energy ℏωp | 22.85 | eV | ||
Muon critical energy | 485. | GeV | ||
Melting point | 83.79 | K | -189.4 | C |
Boiling point @ 1 atm | 87.30 | K | -185.9 | C |
Index of refraction (Na D) | 1.233 |