| Constant | Value |
|---|---|
| Avogadro's number | 6.02 × 1023 atoms |
| Boltzmann's constant | 1.3 × 10-23 J/K |
| Planck's constant | 6.62 × 10-34 J.sec |
| Electron rest mass | 9.11 × 10-31 kg |
| Electron charge | 1.60 × 10-19 C |
| Proton rest mass | 1.67 × 10-27 kg |
| Speed of light in vacuum | 3.0 × 108 m/s |
| Speed of sound in dry air (at 25°C) | 331 m/s |
| Gravitational constant | 6.67 ×10-11 Nm2/kg2 |
| Permittivity of free space | 8.854 × 10-12 F/m |
| Permeability of free space | 12.57 × 10-7 H/m |
| Mean radius of the earth | 6370 km |
| Mass of the earth | 5.98 × 1024 kg |
| e (exponential constant) | 2.7182818 |
| π | 3.1415927 |
| Gravitational acceleration, g | 9.81 m/s2 |
| Universal gas constant, R | 8314 J/kmol.K |
| Standard atmosphere | 1.0132 × 105 N/m2 |
| γ (Euler's constant) | 0.57721566 |