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Physical Constants
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Quantity | Symbol | Value | Units |
| electron charge |
e | 1.602176634 × 10-19 | C |
| speed of light | c | 2.99792458 × 108 | m/s | | Planck's constant | h | 6.62607015 × 10-34 | J s |
| reduced Planck's constant | 
| 1.054571817 × 10-34 | J s | | Boltzmann's constant | kB | 1.380649 × 10-23 | J/K | | Gravitational constant | G | 6.67430 × 10-11 | N m2/kg2 |
Acceleration of gravity
at earth's surface | g | 9.80665 | 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 | 5.29177210903 × 10-10 | m | | proton mass | mp | 1.67262192369 × 10-27 | kg | | neutron mass | mn | 1.67492749804 × 10-27 | kg | | atomic mass constant | mu | 1.66053906660 × 10-27 | kg | | permeability of vacuum | μ0 | 4π × 10-7 | N A-2 | | permittivity of vacuum | ε0 | 8.8541878128 × 10-12 | F m-1 | | Coulomb constant | k | 8.987551788 × 109 | m F-1 | | Avogado's constant | NA | 6.02214076 × 1023 | mol-1 |
π = 3.1415926535897932384626433832795028841971693993751058209749445...
Fundamental Physical Constants (National Institute of Standards and Technology, USA)
SI units
Measurement uncertainty
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