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 |
