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Some of the most important and frequently used constants in physics such as the speed of light, Plank's constant, Earth acceleration and mass, etc ... are listed below.
| Definition | Value |
| Mass of Earth | m E = 5.98 × 1024 Kg |
| (mean) Radius of Earth | r E = 6.4 × 106 m |
| Mass of Moon | m M = 7.36 × 1022 Kg |
| (mean) Radius of Moon | r M = 1.74 × 106 m |
| Mass of Sun | m s = 1.99 × 1030 Kg |
| (mean) Radius of Sun | r s = 6.96 × 108 m |
| Acceleration due to Earth Gravity (near surface of Earth) | g = 9.8 m/s2 |
| Speed of Light in Vacuum | c = 3.00 × 108 m/s |
| Gravitational Constant (appears in Newton's law of universal gravitation) | G = 6.67 × 10-11 N·m2 / kg2 |
| Permeability in Vacuum | μ0 = 4π × 10-7 T·m / A |
| Permittivity in Vacuum | ε0 = 8.854 × 10-12 F / m |
| Coulomb's Constant (in Coulomb's Law) | k = 9.00 × 109 N·m2/C2 |
| Planck's constant h | h = 6.63 × 10-34 J·s |
| Elementary Charge e | e = 1.60 × 10-19 C |
| Mass of Electron | me = 9.109 × 10-31 Kg |
| Mass of Proton | mp = 1.673 × 10-27 Kg |
| Mass of Neutron | mn = 1.675 ×10-27 Kg |
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