Introduction to Unit and Dimensions
Physical Constants
| Constants | Symbols | Values |
| Speed of Light | c | 3×108 m/s |
| Planck Constant | h hc | 6.63×10−34 Js 1242 eV-nm |
Gravitation constant | G | 6.67×10−11 m3 kg−1 s−2 |
| Boltzmann constant | k | 1.38×10−23 J/K |
| Molar gas constant | R | 8.314 J/(mol K) |
| Avogadro’s number | NA | 6.023×1023 mol−1 |
| Charge of electron | e | 1.602×10−19 C |
| Permeability of vacuum | µ0 | 4π×10−7 N/A2 |
| Permitivity of vacuum | 8.85×10−12 F/m | |
| Coulomb constant | 9×109 N m2/C2 | |
| Faraday constant | F | 96485 C/mol |
| Mass of electron | me | 9.1×10−31 kg |
| Mass of proton | mp | 1.6726×10−27 kg |
| Mass of neutron | mn | 1.6749×10−27 kg |
| Atomic mass unit | u | 1.66×10−27 kg |
| Atomic mass unit | u | 931.49 MeV/c2 |
| Stefan-Boltzmann constant | σ | 5.67×10−8 W/(m2 K4) |
| Rydberg constant | R∞ | 1.097×107 m−1 |
| Bohr magneton | µB | 9.27×10−24 J/T |
| Bohr radius | a0 | 0.529×10−10 m |
| Standard atmosphere | atm | 1.01325×105 Pa |
| Wien Displacement Constant | b | 2.9 × 10-3 m K |
