Important Combinations of Physical Constants
| Quantity | Symbol | Value(s) |
| Bohr magneton |  | 927.400915 × 10−26 J T−1 |
| Bohr radius |  | 0.52917720859 × 10−10 m |
| Compton wavelength |  | 2.4263102175 × 10−12 m |
| Molar gas constant | R = NAk | 8.314472 J K−1 mol−1 0.08205746 L atm K−1 mol−1 |
| Rydberg constant |  | 1.0973731568527 × 10−7 m−1 |
| Speed of light |  | 2.99792458 × 108 m/s |
| — |  | 8.98755 × 109 m F−1 F for farad, a unit of capacitance |
| — |  | 1.054571628 × 10−34 J s 6.58211899 × 10−16 eV s |
| — | hc | 1.9864 × 10−25 J m 1239.8 eV nm |
| — |  c | 3.1615 × 10−26 J m 197.33 eV nm |
