| Constant | Symbol | Value |
| Atomic mass unit | amu | 1.66054 × 10-27 kg |
| Avogadro's number | N | 6.02214 × 1023 mol-1 |
| Bohr radius | a0 | 5.292 × 10-11 m |
| Boltzmann constant | k | 1.38066 × 10-23 J/K |
| Charge of an electron | e | 1.60218 × 10-19 C |
| Faraday constant | F | 96458 C/mol |
| Gas constant | R | 8.31451 J/K·mol |
| Mass of an electron | me | 9.10939 × 10-31 kg 5.48580 × 10-4 amu |
| Mass of a neutron | mn | 1.67493 × 10-27 kg 1.00866 amu |
| Mass of a proton | mp | 1.67262 × 10-27 kg 1.00728 amu |
| Planck's constant | h | 6.62608 × 10-34 J·s |
| Speed of light | c | 2.99792458 × 108 m/s |