| Notation | Symbol | Quantity | Unit |
| Speed of light | c | 2.99792458 × 108 | m/s |
| Boltzmann constant | k | 8.617333262 × 10−11 | MeV·K−1 |
| Avogadro number | NA | 6.02214076 × 1023 | mol−1 |
| Sommerfeld constant | Α | 7.2973525693(11) × 10−3 | - |