Physics Course/Physics Constants


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! 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 &times; 10&minus;19 C
 * Unified atomic mass unit || 1 u = 1.66056&times;10&minus;27 kg
 * Constant in Coulomb's law || K = 8.988 × 109 N·m2·kg-2
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 * Elementary charge || e = 1.60217653 &times; 10&minus;19 C
 * Unified atomic mass unit || 1 u = 1.66056&times;10&minus;27 kg
 * Constant in Coulomb's law || K = 8.988 × 109 N·m2·kg-2
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 * Constant in Coulomb's law || K = 8.988 × 109 N·m2·kg-2
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! Constant Name !! Definition
 * Permeability of vacuum || &mu;0 = 4&pi; &times; 10&minus;7T2·m3·J-1 = 12.566370614 &times; 10&minus;7 T2·m3·J-1
 * Permittivity of vacuum || &epsilon;0 = 1/(&mu;0c2) = 8.854187817 &times; 10&minus;12 C2·J-1·m-1
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 * Permittivity of vacuum || &epsilon;0 = 1/(&mu;0c2) = 8.854187817 &times; 10&minus;12 C2·J-1·m-1
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! 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 &times; 1023 mol-1
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 * Avogadro constant || NA = 6.0221415 &times; 1023 mol-1
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! Constant Name !! Definition
 * Absolute zero temperature || 0 K = &minus;273.15 °C
 * Speed of light in vacuum || c = 2.99792458 &times; 108 m·s-1
 * Newtonian constant of gravitation || G = 6.6742 &times; 10&minus;11 m3·kg-1 s-2
 * Planck constant || h = 6.6260693 &times; 10&minus;34 J·Hz-1 = 4.136 × 10-15 eV·s;
 * Planck constant over $$2\pi$$ || $$\hbar$$= 1.05457148 &times; 10&minus;34 J·s
 * Newtonian constant of gravitation || G = 6.6742 &times; 10&minus;11 m3·kg-1 s-2
 * Planck constant || h = 6.6260693 &times; 10&minus;34 J·Hz-1 = 4.136 × 10-15 eV·s;
 * Planck constant over $$2\pi$$ || $$\hbar$$= 1.05457148 &times; 10&minus;34 J·s
 * Planck constant over $$2\pi$$ || $$\hbar$$= 1.05457148 &times; 10&minus;34 J·s
 * Planck constant over $$2\pi$$ || $$\hbar$$= 1.05457148 &times; 10&minus;34 J·s






 * Boltzmann's constant || k = 1.3806505 &times; 10&minus;23 J K-1
 * Stefan-Boltzmann constant || &sigma; = 5.670400 &times; 10&minus;8 W·m-2·K-4
 * Stefan-Boltzmann constant || &sigma; = 5.670400 &times; 10&minus;8 W·m-2·K-4
 * Stefan-Boltzmann constant || &sigma; = 5.670400 &times; 10&minus;8 W·m-2·K-4


 * Bohr radius || a0 = 5.292 &times; 10&minus;11 m
 * Electron radius || re = 2.81792 &times; 10-15
 * Electron radius || re = 2.81792 &times; 10-15
 * Electron radius || re = 2.81792 &times; 10-15


 * Fine structure constant || &alpha; = e2/(2&epsilon;0hc) = 1/137.0359895 = 7.2974 &times; 10-3
 * Thomson cross-section || &sigma;e = 6.652 × 10&minus;29 m2
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 * Thomson cross-section || &sigma;e = 6.652 × 10&minus;29 m2
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Some values from the 2002 CODATA recommended values of the Fundamental Physical Constants. See Constants Information at NIST.