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Physical Constants
Quantity | Symbol | Value | Units | | electron charge |
e | 1.60217733 × 10-19 | C |
| speed of light | c | 2.99792458 × 108 | m/s | | Planck's constant | h | 6.6260755 × 10-34 | J s |
| reduced Planck's constant | 
| 1.05457266 × 10-34 | J s | | Boltzmann's constant | kB | 1.380658 × 10-23 | J/K | | Gravitational constant | G | 6.6726 × 10-11 | N m2/kg2 |
Acceleration of gravity
at earth's surface | g | 9.807 | m/s2 | | electron mass | me | 9.1093897 × 10-31 | kg | | Stefan-Boltzmann constant | σ | 5.67051 × 10-8 | W m-2 K-4 | | Bohr radius | a0 | 0.529177249 × 10-10 | m | | proton mass | mp | 1.6726231 × 10-27 | kg | | neutron mass | mn | 1.6749286 × 10-27 | kg | | atomic mass constant | mu | 1.6605402 × 10-27 | kg | | permeability of vacuum | μ0 | 4π × 10-7 | N A-2 | | permittivity of vacuum | ε0 | 8.854187817 × 10-12 | F m-1 | | Coulomb constant | k | 8.98755 × 109 | m F-1 | | Avogado's constant | NA | 6.0221367 × 1023 | mol-1 |
π ≈ 3.141592653589793238462643383279502884197 Fundamental Physical Constants (National Institute of Standards and Technology, USA)
SI units
Measurement uncertainty
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