James Richard Fromm
| Constant | Symbol | Value (+/- Uncertainty | SI Unit |
| Avogadro | NA | 6.0221367(36) x 10+23 | Mol-l |
| Boltzmann | k | 1.380658(12) x 10-23 | J/K |
| Faraday | F | 96,485.309(29) | C/mol |
| Planck | h | 6.6260755(40) x 10-34 | J s |
| Rydberg | Rinf. | 10973731.534(13) | m-l |
| Stefan-Boltzmann | GK s | 5.67051(19) x 10-8 | J m-2s-1K-4 |
| molar gas | R | 8.3143510(70) | J/K mole |
| elementary charge | e | 1.60217733(49) x 10-19 | C |
| "ice-point" | T (ice) | 273.1500+/-0.0001 | K |
| speed of light | c | 299,792,458(0) | m/s |
| permittivity | GK e0 | 8.8541878176... x 10-12 | F/m |
| atomic mass unit | u | 1.6605402(10) x 10-27 | kg |