| Quantity | Value | Units | Value | Units |
| <Z/A> | 0.49985 | |||
| Specific gravity (20° C, 1 atm) | 1.83E-03 | g cm-3 | ||
| Minimum ionization | 1.819 | MeV g-1cm2 | 3.331E-03 | MeV cm-1 |
| Nuclear collision length | 61.2 | g cm-2 | 3.341E+04 | cm |
| Nuclear interaction length | 89.9 | g cm-2 | 4.908E+04 | cm |
| Radiation length | 36.53 | g cm-2 | 1.995E+04 | cm |
| Critical energy | 87.10 | MeV (for e-) | 85.16 | MeV (for e+) |
| Molière radius | 8.89 | g cm-2 | 4858. | cm |
Plasma energy ![]() |
0.87 | eV | ||
| Muon critical energy | 1104. | GeV |
| Elem | Z | Atomic frac* | Mass frac* |
| 7 | |||
| 8 | |||
| * calculated from mass fraction data. | |||