3.091 Table of Fundamental Physical Constants This data is derived from the 1986 CODATA recommended values of the fundamental physical constants. It is not intended to be an authoritative source: typographical errors are possible and the data has been reformatted. You can find the more complete information from the NIST at http://physics.nist.gov/PhysRefData/codata86/codata86.html. light year= 9.461e17cm #ConstantSymbolValueUnits 1Speed of light in vacuum (c) 299792458m s-1 2Permeability of vacuum (mu_0) 1.25663706143592e-06N A-2 3Permittivity of vacuum (epsilon_0) 8.854187817e-12F m-1 4Newtonian constant of gravitation (G) 6.67259e-11 ± 8.5e-15m3 kg-1 s-2 5Planck constant (h) 6.6260755e-34 ± 4.0e-40J s 6Planck constant in eV 4.1356692e-15 ± 1.2e-21eV s 7h-bar (h-bar) 1.05457266e-34 ± 6.3e-41J s 8h-bar in eV 6.582122e-16 ± 2.0e-22eV s 9Planck mass (m_p) 2.17671e-08 ± 1.4e-12kg 10Planck length (l_p) 1.61605e-35 ± 1.0e-39m 11Planck time (t_p) 5.39056e-44 ± 3.4e-48s 12Elementary charge (e) 1.60217733e-19 ± 4.9e-26C 13Magnetic flux quantum (Phi_0) 2.06783461e-15 ± 6.1e-22Wb 14Josephson frequency-voltage quotient 483597670000000 ± 1.4e+08V-1 s-1 15Quantized Hall conductance 3.87404614e-05 ± 1.7e-12Omega-1 16Quantized Hall resistance (R_H) 25812.8056 ± 0.0012Omega 17Bohr magneton (mu_B) 9.2740154e-24 ± 3.1e-30J T-1 18Bohr magneton in eV 5.78838263e-05 ± 5.2e-12eV T-1 19Bohr magneton in Hz 13996241800 ± 4200T-1 s-1 20Bohr magneton in wavenumbers 46.686437 ± 1.4e-05m-1 T-1 21Bohr magneton in kelvins 0.6717099 ± 5.7e-06K T-1 22Nuclear magneton (mu_N) 5.0507866e-27 ± 1.7e-33J T-1 23Nuclear magneton in eV 3.15245166e-08 ± 2.8e-15eV T-1 24Nuclear magneton in Hz 7622591.4 ± 2.3T-1 s-1 25Nuclear magneton in wavenumbers 0.0254262281 ± 7.7e-09m-1 T-1 26Nuclear magneton in kelvins 0.0003658246 ± 3.1e-09K T-1 27Fine structure constant (alpha) 0.00729735308 ± 3.3e-10 28Inverse fine structure constant 137.0359895 ± 6.1e-06 29Rydberg constant (Ry) 10973731.534 ± 0.013m-1 30Rydberg constant in Hz 3.2898419499e+15 ± 3.9e+06s-1 31Rydberg constant in joules 2.1798741e-18 ± 1.3e-24J 32Rydberg constant in eV 13.6056981 ± 4.0e-06eV 33Bohr radius (a_0) 5.29177249e-11 ± 2.4e-18m 34Hartree energy (E_h) 4.3597482e-18 ± 2.6e-24J 35Hartree energy in eV 27.2113961 ± 8.1e-06eV 36Quantum of circulation 0.000363694807 ± 3.3e-11m2 s-1 37Electron mass (m_e) 9.1093897e-31 ± 5.4e-37kg 38Electron mass in u 0.000548579903 ± 1.3e-11u 39Electron mass in eV 510999.06 ± 0.15eV 40Electron-muon mass ratio 0.00483633218 ± 7.1e-10 41Electron-proton mass ratio 0.000544617013 ± 1.1e-11 42Electron-deuteron mass ratio 0.000272443707 ± 6e-12 43Electron-alpha-particle mass ratio 0.000137093354 ± 3e-12 44Electron specific charge -175881962000 ± -53000C kg-1 45Electron molar mass 5.48579903e-07 ± 1.3e-14kg mol-1 46Electron Compton wavelength (lambda_C) 2.42631058e-12 ± 2.2e-19m 47Electron Compton wavelength over 2 pi (lambda-bar_C)3.86159323e-13 ± 3.5e-20m 48Electron classical radius (r_e) 2.81794092e-15 ± 3.8e-22m 49Electron Thomson cross section (sigma_e) 6.6524616e-29 ± 1.8e-35m2 50Electron magnetic moment 9.2847701e-24 ± 3.1e-30J T-1 51Electron magnetic moment in Bohr magnetons 1.001159652193 ± 1.0e-11 52Electron magnetic moment in nuclear magnetons 1838.282 ± 3.7e-05 53Electron magnetic moment anomaly (a_e) 0.001159652193 ± 1.0e-11 54Electron g-factor (g_e) 2.002319304386 ± 2.0e-11 55Electron-muon magnetic moment ratio 206.766967 ± 3.0e-05 56Electron-proton magnetic moment ratio 658.2106881 ± 6.6e-06 57Muon mass 1.8835327e-28 ± 1.1e-34kg 58Muon mass in u 0.113428913 ± 1.7e-08u 59Muon mass in eV 105658389 ± 34eV 60Muon-electron mass ratio 206.768262 ± 3.0e-05 61Muon molar mass 0.000113428913 ± 1.7e-11kg mol-1 62Muon magnetic moment 4.4904514e-26 ± 1.5e-32J T-1 63Muon magnetic moment in Bohr magnetons 0.00484197097 ± 7.1e-10 64Muon magnetic moment in nuclear magnetons 8.8905981 ± 1.3e-06 65Muon magnetic moment anomaly (a_mu) 0.001165923 ± 8.4e-09 66Muon g-factor (g_mu) 2.002331846 ± 1.7e-08 67Muon-proton magnetic moment ratio 3.18334547 ± 4.7e-07 68Proton mass (m_p) 1.6726231e-27 ± 1.0e-33kg 69Proton mass in u 1.00727647 ± 1.2e-08u 70Proton mass in eV 938272310 ± 280eV 71Proton-electron mass ratio 1836.152701 ± 3.7e-05 72Proton-muon mass ratio 8.8802444 ± 1.3e-06 73Proton specific charge 95788309 ± 29C kg-1 74Proton molar mass 0.00100727647 ± 1.2e-11kg mol-1 75Proton Compton wavelength (lambda_C,p)1.32141002e-15 ± 1.2e-22m 76Proton magnetic moment 1.41060761e-26 ± 4.7e-33J T-1 77Proton magnetic moment in Bohr magnetons 0.001521032202 ± 1.5e-11 78Proton magnetic moment in nuclear magnetons 2.792847386 ± 6.3e-08 79Diamagnetic shielding correction for protons (H_2 O, spherical sample, 298.15 K)(sigma_H2O) 2.5689e-05 ± 1.5e-08 80Shielded proton moment (H_2 O, spherical sample, 298.15 K)(mu_p') 1.41057138e-26 ± 4.7e-33J T-1 81Shielded proton moment in Bohr magnetons 0.001520993129 ± 1.7e-11 82Shielded proton moment in nuclear magnetons 2.792775642 ± 6.4e-08 83Proton gyromagnetic ratio (gamma_p) 267522128 ± 81T-1 s-1 84(gamma_p) 42577469 ± 13T-1 s-1 85Proton gyromagnetic ratio, uncorrected (H_2 O, spherical sample, 298.15 K)(gamma_p') 267515255 ± 81T-1 s-1 86(gamma_p'/2pi)42576375 ± 13T-1 s-1 87Neutron mass (m_n) 1.6749286e-27 ± 1.0e-33kg 88Neutron mass in u 1.008664904 ± 1.4e-08u 89Neutron mass in eV 939565630 ± 280eV 90Neutron-electron mass ratio 1838.683662 ± 4.0e-05 91Neutron-proton mass ratio 1.001378404 ± 9e-09 92Neutron molar mass 0.001008664904 ± 1.4e-11kg mol-1 93Neutron Compton wavelength (lambda_C,n)1.3195911e-15 ± 1.2e-22m 94Neutron magnetic moment 9.6623707e-27 ± 4.0e-33J T-1 95Neutron magnetic moment in Bohr magnetons 0.00104187563 ± 2.5e-10 96Neutron magnetic moment in nuclear magnetons 1.91304275 ± 4.5e-07 97Neutron-electron magnetic moment ratio 0.00104066882 ± 2.5e-10 98Neutron-proton magnetic moment ratio 0.68497934 ± 1.6e-07 99Deuteron mass (m_d) 3.343586e-27 ± 2.0e-33kg 100Deuteron mass in u 2.013553214 ± 2.4e-08u 101Deuteron mass in eV 1875613390 ± 570eV 102Deuteron-electron mass ratio 3670.483014 ± 7.5e-05 103Deuteron-proton mass ratio 1.999007496 ± 6e-09 104Deuteron molar mass 0.002013553214 ± 2.4e-11kg mol-1 105Deuteron magnetic moment (mu_d) 4.3307375e-27 ± 1.5e-33J T-1 106Deuteron magnetic moment in Bohr magnetons 0.0004669754479 ± 9.1e-12 107Deuteron magnetic moment in nuclear magnetons 0.85743823 ± 2.4e-08 108Deuteron-electron magnetic moment ratio 0.000466434546 ± 9.1e-12 109Deuteron-proton magnetic moment ratio 0.3070122035 ± 5.1e-09 110Avagadro constant (N_A) 6.0221367e+23 ± 3.6e+17mol-1 111Atomic mass constant (m_u) 1.6605402e-27 ± 1.0e-33kg 112Atomic mass constant in eV 931494320 ± 280eV 113Faraday constant (F) 96485.309 ± 0.029C mol-1 114Molar Planck constant 3.99031323e-10 ± 3.6e-17J s mol-1 115(N_A hc) 0.11962658 ± 1.1e-07J m mol-1 116Molar gas constant (R) 8.31451 ± 7.0e-05J mol-1 K-1 117Boltzmann constant (k) 1.380658e-23 ± 1.2e-28J K-1 118Boltzmann constant in eV 8.617385e-05 ± 7.3e-10eV K-1 119Boltzmann constant in Hz 20836740000 ± 180000K-1 s-1 120Boltzmann constant in wavenumbers 69.50387 ± 0.00059m-1 K-1 121Molar volume (ideal gas), STP (V_m) 0.0224141 ± 1.9e-07m3 mol-1 122Loschmidt constant (n_0) 2.686763e+25 ± 2.3e+20m-3 123Stefan-Boltzmann constant (sigma) 5.67051e-08 ± 1.9e-12W m-2 K-4 124First radiation constant (c_1) 3.7417749e-16 ± 2.2e-22W m2 125Second radiation constant (c_2) 0.01438769 ± 1.2e-07m K 126Wien displacement law constant (b) 0.002897756 ± 2.4e-08m K 127Electron volt (eV) 1.60217733e-19 ± 4.9e-26J 128Atomic mass unit (u) 1.6605402e-27 ± 1.0e-33kg 129Standard atmosphere (atm) 101325Pa 130Standard acceleration of gravity (g_n) 9.80665m s-2 131BIPM-maintained ohm, Omega_69-B1 as of 1 Jan 85(Omega_B185)1-1.563e-6 ± 5.0e-08Omega 132Drift rate of Omega_69-B1 (dOmega_69-B1/dt)-0.0566 ± -0.0015muOmega/yr 133BIPM-maintained volt 483 694 GHz(h/2e) (V_76-B1) 1-7.59e-6 ± 3.0e-07V 134BIPM maintained ampere A_BIPM (A_B185) 1-6.03e-6 ± 3.0e-07A 135Cu x-unit: (xu(CuKalpha1))1.00207789e-13 ± 7.0e-20m 136Mo x-unit: (xu(MoKalpha1))1.00209938e-13 ± 4.5e-20m 137AA *: (AAngstrom-star)1.00001481e-10 ± 9.2e-17m 138Lattice spacing of Si (in vacuum, 295.65 K)(a) 5.4310196e-10 ± 1.1e-16m 139Lattice spacing Si (220) plane (d_220) 1.9201554e-10 ± 4.0e-17m 140Molar volume of Si (V_m(Si)) 1.20588179e-05 ± 8.9e-12m3 mol-1 Table Version 1.1 3.091 Home Page