| Quantity | Value | Units | Value | Units |
| <Z/A> | 0.47966 | |||
| Specific gravity (20° C, 1 atm) | 0.950 | g cm-3 | ||
| Minimum ionization | 1.668 | MeV g-1cm2 | 1.584 | MeV cm-1 |
| Nuclear collision length | 66.9 | g cm-2 | 70.45 | cm |
| Nuclear interaction length | 101.3 | g cm-2 | 106.6 | cm |
| Pion collision length | 93.2 | g cm-2 | 98.06 | cm |
| Pion interaction length | 131.5 | g cm-2 | 138.4 | cm |
| Radiation length | 27.12 | g cm-2 | 28.55 | cm |
| Critical energy | 50.36 | MeV (for e-) | 48.99 | MeV (for e+) |
| Molière radius | 11.42 | g cm-2 | 12.02 | cm |
Plasma energy ![]() |
19.45 | eV | ||
| Muon critical energy | 699. | GeV |
| Elem | Z | Atomic frac* | Mass frac* |
| 6 | |||
| 9 | |||
| 17 | |||
| * calculated from mass fraction data. | |||