Physics Course/Physics Constants

{| class="wikitable" width=100% ! Constant Name !! Definition |- |Mass of an electron || me = 9.1093897 × 10-31 kg |- |Mass of a proton || mp = 1.6726231 × 10-27 kg |- |Mass of a neutron || mn = 1.6749286 × 10-27 kg |- |Elementary charge || e = 1.60217653 × 10−19 C |- |Unified atomic mass unit || 1 u = 1.66056×10−27 kg |- |Constant in Coulomb's law || K = 8.988 × 109 N·m2·kg-2 |} {| class="wikitable" width=100% ! Constant Name !! Definition |- |Permeability of vacuum || μ0 = 4π × 10−7T2·m3·J-1 = 12.566370614 × 10−7 T2·m3·J-1 |- |Permittivity of vacuum || ε0 = 1/(μ0c2) = 8.854187817 × 10−12 C2·J-1·m-1 |- |} {| class="wikitable" width=100% ! Constant Name !! Definition |- |Molar gas constant || R = 8.314472 J·mol-1·K-1 |- |Molar Volume || Vmol = 22.41383 m3·kmol-1 |- |Avogadro constant || NA = 6.0221415 × 1023 mol-1 |- |} {| class="wikitable" width=100% ! Constant Name !! Definition |- |Absolute zero temperature || 0 K = −273.15 °C |- |Speed of light in vacuum || c = 2.99792458 × 108 m·s-1 |- |Newtonian constant of gravitation || G = 6.6742 × 10−11 m3·kg-1 s-2 |- |Planck constant || h = 6.6260693 × 10−34 J·Hz-1 = 4.136 × 10-15 eV·s; |- |Planck constant over || = 1.05457148 × 10−34 J·s |- |- |- |- |Boltzmann's constant || k = 1.3806505 × 10−23 J K-1 |- |Stefan-Boltzmann constant || σ = 5.670400 × 10−8 W·m-2·K-4 |- |- |Bohr radius || a0 = 5.292 × 10−11 m |- |Electron radius || re = 2.81792 × 10-15 |- |Fine structure constant || α = e2/(2ε0hc) = 1/137.0359895 = 7.2974 × 10-3 |- |Thomson cross-section || σe = 6.652 × 10−29 m2 |} Some values from the 2002 CODATA recommended values of the Fundamental Physical Constants. See Constants Information at NIST.