The following is the list of important fundamental physical constants and their values
| Sl. No | Physical Constant | Symbol | Value |
| 1. | Avogadro Constant | NA | 6.022×1023 mol−1 |
| 2. | Bohr Magneton | µB | 9.27×10−24 J⋅T−1 |
| 3. | Bohr Radius | a0 | 5.29×10−11 m |
| 4. | Boltzmann Constant | kB | 1.38×10−23 J⋅K−1 |
| 5. | Classical Electron Radius | re | 2.817×10−15 m |
| 6. | Conductance Quantum | G0 | 7.748×10−5 S |
| 7. | Coulomb Constant | k | 8.98×109 kg⋅m3⋅s−2⋅C−2 |
| 8. | Electron g-factor | ge | −2.002 |
| 9. | Electron Mass | me | 9.109×10−31 kg |
| 10. | Elementary Charge | e | 1.6×10−19 C |
| 11. | Faraday Constant | F | 96485.33… C⋅mol−1 |
| 12. | Fine Structure Constant | α | 7.297×10−3 |
| 13. | Gas Constant | R | 8.314J⋅mol−1⋅K−1 |
| 14. | Inverse Fine Structure Constant | α-1 | 137.035 |
| 15. | Josephson Constant | KJ | 483597.848×109 Hz⋅V−1 |
| 16. | Neutron Mass | mN | 1.674×10−27 kg |
| 17. | Nuclear Magneton | µN | 5.05×10−27 J⋅T−1 |
| 18. | Planck’s Constant | h | 6.626×10−34 J⋅s |
| 19. | Proton Mass | mp | 1.672×10−27 kg |
| 20. | Rydberg Constant | R∞ | 10973731.568 m−1 |
| 21. | Speed of light | c | 3×108 m⋅s−1 |
| 22. | Stefan-Boltzmann Constant | σ | 5.67 ×10−8 W⋅m−2⋅K−4 |
| 23. | Universal Gravitational Constant | G | 6.67×10−11 m3⋅kg−1⋅s−2 |
| 24. | Vacuum Electric Permittivity | ε0 | 8.854×10−12 F⋅m−1 |
| 25. | Vacuum Magnetic Permeability | µ0 | 1.257×10−6 N⋅A−2 |
| 26. | Wein Constant | b | 2.897×10−3 m⋅K |
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