| Speed of light | c | = | 2.9979 × 108 m/s |
| Gravitational constant | G | = | 6.673 × 10−11 N m2/kg2 |
| Planck’s constant | h | = | 6.6261 × 10−34 J s |
| = | 4.1357 × 10−15 eV s | ||
| Boltzmann constant | k | = | 1.3807 × 10−23 J/K |
| = | 8.6173 × 10−5 eV/K | ||
| Stefan-Boltzmann constant | σ | = | 5.6704 × 10−8 W m−2 K−4 |
| Mass of electron | me | = | 9.1094 × 10−31 kg |
| Mass of proton | mp | = | 1.6726 × 10−27 kg |
| Mass of neutron | mn | = | 1.6749 × 10−27 kg |
| Mass of hydrogen atom | mH | = | 1.6735 × 10−27 kg |
| Rydberg constant | R | = | 1.0973 × 107 m−1 |
| Electron volt | 1 eV | = | 1.6022 × 10−19 J |