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Fundamental Physical Constants Quantity Value Uncertainty Unit Speed of light in vacuum 299 792 458 (exact) m s-1 Magn. constant 12.566 370 614...e-7 (exact) N A-2 Electric constant 8.854 187 817...e-12 (exact) F m-1 Characteristic impedance of vacuum 376.730 313 461... (exact) ohm Newtonian constant of gravitation 6.6742e-11 0.0010e-11 m3 kg-1 s-2 Newtonian constant of gravitation over h-bar c 6.7087e-39 0.0010e-39 (GeV/c2)-2 Planck constant 6.626 0693e-34 0.000 0011e-34 J s Planck constant in eV s 4.135 667 43e-15 0.000 000 35e-15 eV s Planck constant over 2 pi times c in MeV fm 197.326 968 0.000 017 MeV fm Planck constant over 2 pi 1.054 571 68e-34 0.000 000 18e-34 J s Planck constant over 2 pi in eV s 6.582 119 15e-16 0.000 000 56e-16 eV s Planck mass 2.176 45e-8 0.000 16e-8 kg Planck temperature 1.416 79e32 0.000 11e32 K Planck length 1.616 24e-35 0.000 12e-35 m Planck time 5.391 21e-44 0.000 40e-44 s Elementary charge 1.602 176 53e-19 0.000 000 14e-19 C Elementary charge over h 2.417 989 40e14 0.000 000 21e14 A J-1 Magn. flux quantum 2.067 833 72e-15 0.000 000 18e-15 Wb Conductance quantum 7.748 091 733e-5 0.000 000 026e-5 S Inverse of conductance quantum 12 906.403 725 0.000 043 ohm Josephson constant 483 597.879e9 0.041e9 Hz V-1 von Klitzing constant 25 812.807 449 0.000 086 ohm Bohr magneton 927.400 949e-26 0.000 080e-26 J T-1 Bohr magneton in eV/T 5.788 381 804e-5 0.000 000 039e-5 eV T-1 Bohr magneton in Hz/T 13.996 2458e9 0.000 0012e9 Hz T-1 Bohr magneton in inverse meters per tesla 46.686 4507 0.000 0040 m-1 T-1 Bohr magneton in K/T 0.671 7131 0.000 0012 K T-1 Nuclear magneton 5.050 783 43e-27 0.000 000 43e-27 J T-1 Nuclear magneton in eV/T 3.152 451 259e-8 0.000 000 021e-8 eV T-1 Nuclear magneton in MHz/T 7.622 593 71 0.000 000 65 MHz T-1 Nuclear magneton in inverse meters per tesla 2.542 623 58e-2 0.000 000 22e-2 m-1 T-1 Nuclear magneton in K/T 3.658 2637e-4 0.000 0064e-4 K T-1 Fine-structure constant 7.297 352 568e-3 0.000 000 024e-3 Inverse fine-structure constant 137.035 999 11 0.000 000 46 Rydberg constant 10 973 731.568 525 0.000 073 m-1 Rydberg constant times c in Hz 3.289 841 960 360e15 0.000 000 000 022e15 Hz Rydberg constant times hc in J 2.179 872 09e-18 0.000 000 37e-18 J Rydberg constant times hc in eV 13.605 6923 0.000 0012 eV Bohr radius 0.529 177 2108e-10 0.000 000 0018e-10 m Hartree energy 4.359 744 17e-18 0.000 000 75e-18 J Hartree energy in eV 27.211 3845 0.000 0023 eV Quantum of circulation 3.636 947 550e-4 0.000 000 024e-4 m2 s-1 Quantum of circulation times 2 7.273 895 101e-4 0.000 000 048e-4 m2 s-1 Fermi coupling constant 1.166 39e-5 0.000 01e-5 GeV-2 Weak mixing angle 0.222 15 0.000 76 Electron mass 9.109 3826e-31 0.000 0016e-31 kg Electron mass in u 5.485 799 0945e-4 0.000 000 0024e-4 u Electron mass energy equivalent 8.187 1047e-14 0.000 0014e-14 J Electron mass energy equivalent in MeV 0.510 998 918 0.000 000 044 MeV Electron-muon mass ratio 4.836 331 67e-3 0.000 000 13e-3 Electron-tau mass ratio 2.875 64e-4 0.000 47e-4 Electron-proton mass ratio 5.446 170 2173e-4 0.000 000 0025e-4 Electron-neutron mass ratio 5.438 673 4481e-4 0.000 000 0038e-4 Electron-deuteron mass ratio 2.724 437 1095e-4 0.000 000 0013e-4 Electron to alpha particle mass ratio 1.370 933 555 75e-4 0.000 000 000 61e-4 Electron charge to mass quotient -1.758 820 12e11 0.000 000 15e11 C kg-1 Electron molar mass 5.485 799 0945e-7 0.000 000 0024e-7 kg mol-1 Compton wavelength 2.426 310 238e-12 0.000 000 016e-12 m Compton wavelength over 2 pi 386.159 2678e-15 0.000 0026e-15 m Classical electron radius 2.817 940 325e-15 0.000 000 028e-15 m Thomson cross section 0.665 245 873e-28 0.000 000 013e-28 m2 Electron magn. moment -928.476 412e-26 0.000 080e-26 J T-1 Electron magn. moment to Bohr magneton ratio -1.001 159 652 1859 0.000 000 000 0038 Electron magn. moment to nuclear magneton ratio -1838.281 971 07 0.000 000 85 Electron magn. moment anomaly 1.159 652 1859e-3 0.000 000 0038e-3 Electron g factor -2.002 319 304 3718 0.000 000 000 0075 Electron-muon magn. moment ratio 206.766 9894 0.000 0054 Electron-proton magn. moment ratio -658.210 6862 0.000 0066 Electron to shielded proton magn. moment ratio -658.227 5956 0.000 0071 Electron-neutron magn. moment ratio 960.920 50 0.000 23 Electron-deuteron magn. moment ratio -2143.923 493 0.000 023 Electron to shielded helion magn. moment ratio 864.058 255 0.000 010 Electron gyromagn. ratio 1.760 859 74e11 0.000 000 15e11 s-1 T-1 Electron gyromagn. ratio over 2 pi 28 024.9532 0.0024 MHz T-1 Muon Mass 1.883 531 40e-28 0.000 000 33e-28 kg Muon Mass in u 0.113 428 9264 0.000 000 0030 u Muon Mass energy equivalent 1.692 833 60e-11 0.000 000 29e-11 J Muon Mass energy equivalent in MeV 105.658 3692 0.000 0094 MeV Muon-Electron mass ratio 206.768 2838 0.000 0054 Muon-Tau mass ratio 5.945 92e-2 0.000 97e-2 Muon-Proton mass ratio 0.112 609 5269 0.000 000 0029 Muon-Neutron mass ratio 0.112 454 5175 0.000 000 0029 Muon Molar mass 0.113 428 9264e-3 0.000 000 0030e-3 kg mol-1 Muon Compton wavelength 11.734 441 05e-15 0.000 000 30e-15 m Muon Compton wavelength over 2 pi 1.867 594 298e-15 0.000 000 047e-15 m Muon Magn. moment -4.490 447 99e-26 0.000 000 40e-26 J T-1 Muon Magn. moment to Bohr magneton ratio -4.841 970 45e-3 0.000 000 13e-3 Muon Magn. moment to nuclear magneton ratio -8.890 596 98 0.000 000 23 Muon Magn. moment anomaly 1.165 919 81e-3 0.000 000 62e-3 Muon G factor -2.002 331 8396 0.000 000 0012 Muon-Proton magn. moment ratio -3.183 345 118 0.000 000 089 Tau Mass 3.167 77e-27 0.000 52e-27 kg Tau Mass in u 1.907 68 0.000 31 u Tau Mass energy equivalent 2.847 05e-10 0.000 46e-10 J Tau Mass energy equivalent in MeV 1776.99 0.29 MeV Tau-Electron mass ratio 3477.48 0.57 Tau-Muon mass ratio 16.8183 0.0027 Tau-Proton mass ratio 1.893 90 0.000 31 Tau-Neutron mass ratio 1.891 29 0.000 31 Tau Molar mass 1.907 68e-3 0.000 31e-3 kg mol-1 Tau Compton wavelength 0.697 72e-15 0.000 11e-15 m Tau Compton wavelength over 2 pi 0.111 046e-15 0.000 018e-15 m Proton mass 1.672 621 71e-27 0.000 000 29e-27 kg Proton mass in u 1.007 276 466 88 0.000 000 000 13 u Proton mass energy equivalent 1.503 277 43e-10 0.000 000 26e-10 J Proton mass energy equivalent in MeV 938.272 029 0.000 080 MeV Proton-electron mass ratio 1836.152 672 61 0.000 000 85 Proton-muon mass ratio 8.880 243 33 0.000 000 23 Proton-tau mass ratio 0.528 012 0.000 086 Proton-neutron mass ratio 0.998 623 478 72 0.000 000 000 58 Proton charge to mass quotient 9.578 833 76e7 0.000 000 82e7 C kg-1 Proton molar mass 1.007 276 466 88e-3 0.000 000 000 13e-3 kg mol-1 Proton Compton wavelength 1.321 409 8555e-15 0.000 000 0088e-15 m Proton Compton wavelength over 2 pi 0.210 308 9104e-15 0.000 000 0014e-15 m Proton magn. moment 1.410 606 71e-26 0.000 000 12e-26 J T-1 Proton magn. moment to Bohr magneton ratio 1.521 032 206e-3 0.000 000 015e-3 Proton magn. moment to nuclear magneton ratio 2.792 847 351 0.000 000 028 Proton g factor 5.585 694 701 0.000 000 056 Proton-neutron magn. moment ratio -1.459 898 05 0.000 000 34 Shielded proton magn. moment 1.410 570 47e-26 0.000 000 12e-26 J T-1 Shielded proton magn. moment to Bohr magneton ratio 1.520 993 132e-3 0.000 000 016e-3 Shielded proton magn. moment to nuclear magneton ratio 2.792 775 604 0.000 000 030 Proton magn. shielding correction 25.689e-6 0.015e-6 Proton gyromagn. ratio 2.675 222 05e8 0.000 000 23e8 s-1 T-1 Proton gyromagn. ratio over 2 pi 42.577 4813 0.000 0037 MHz T-1 Shielded proton gyromagn. ratio 2.675 153 33e8 0.000 000 23e8 s-1 T-1 Shielded proton gyromagn. ratio over 2 pi 42.576 3875 0.000 0037 MHz T-1 Proton rms charge radius 0.8750e-15 0.0068e-15 m Neutron mass 1.674 927 28e-27 0.000 000 29e-27 kg Neutron mass in u 1.008 664 915 60 0.000 000 000 55 u Neutron mass energy equivalent 1.505 349 57e-10 0.000 000 26e-10 J Neutron mass energy equivalent in MeV 939.565 360 0.000 081 MeV Neutron-electron mass ratio 1838.683 6598 0.000 0013 Neutron-muon mass ratio 8.892 484 02 0.000 000 23 Neutron-tau mass ratio 0.528 740 0.000 086 Neutron-proton mass ratio 1.001 378 418 70 0.000 000 000 58 Neutron molar mass 1.008 664 915 60e-3 0.000 000 000 55e-3 kg mol-1 Neutron Compton wavelength 1.319 590 9067e-15 0.000 000 0088e-15 m Neutron Compton wavelength over 2 pi 0.210 019 4157e-15 0.000 000 0014e-15 m Neutron magn. moment -0.966 236 45e-26 0.000 000 24e-26 J T-1 Neutron magn. moment to Bohr magneton ratio -1.041 875 63e-3 0.000 000 25e-3 Neutron magn. moment to nuclear magneton ratio -1.913 042 73 0.000 000 45 Neutron g factor -3.826 085 46 0.000 000 90 Neutron-electron magn. moment ratio 1.040 668 82e-3 0.000 000 25e-3 Neutron-proton magn. moment ratio -0.684 979 34 0.000 000 16 Neutron to shielded proton magn. moment ratio -0.684 996 94 0.000 000 16 Neutron gyromagn. ratio 1.832 471 83e8 0.000 000 46e8 s-1 T-1 Neutron gyromagn. ratio over 2 pi 29.164 6950 0.000 0073 MHz T-1 Deuteron mass 3.343 583 35e-27 0.000 000 57e-27 kg Deuteron mass in u 2.013 553 212 70 0.000 000 000 35 u Deuteron mass energy equivalent 3.005 062 85e-10 0.000 000 51e-10 J Deuteron mass energy equivalent in MeV 1875.612 82 0.000 16 MeV Deuteron-electron mass ratio 3670.482 9652 0.000 0018 Deuteron-proton mass ratio 1.999 007 500 82 0.000 000 000 41 Deuteron molar mass 2.013 553 212 70e-3 0.000 000 000 35e-3 kg mol-1 Deuteron magn. moment 0.433 073 482e-26 0.000 000 038e-26 J T-1 Deuteron magn. moment to Bohr magneton ratio 0.466 975 4567e-3 0.000 000 0050e-3 Deuteron magn. moment to nuclear magneton ratio 0.857 438 2329 0.000 000 0092 Deuteron-electron magn. moment ratio -4.664 345 548e-4 0.000 000 050e-4 Deuteron-proton magn. moment ratio 0.307 012 2084 0.000 000 0045 Deuteron-neutron magn. moment ratio -0.448 206 52 0.000 000 11 Deuteron rms charge radius 2.1394e-15 0.0028e-15 m Helion mass 5.006 412 14e-27 0.000 000 86e-27 kg Helion mass in u 3.014 932 2434 0.000 000 0058 u Helion mass energy equivalent 4.499 538 84e-10 0.000 000 77e-10 J Helion mass energy equivalent in MeV 2808.391 42 0.000 24 MeV Helion-electron mass ratio 5495.885 269 0.000 011 Helion-proton mass ratio 2.993 152 6671 0.000 000 0058 Helion molar mass 3.014 932 2434e-3 0.000 000 0058e-3 kg mol-1 Shielded helion magn. moment -1.074 553 024e-26 0.000 000 093e-26 J T-1 Shielded helion magn. moment to Bohr magneton ratio -1.158 671 474e-3 0.000 000 014e-3 Shielded helion magn. moment to nuclear magneton ratio -2.127 497 723 0.000 000 025 Shielded helion to proton magn. moment ratio -0.761 766 562 0.000 000 012 Shielded helion to shielded proton magn. moment ratio -0.761 786 1313 0.000 000 0033 Shielded helion gyromagn. ratio 2.037 894 70e8 0.000 000 18e8 s-1 T-1 Shielded helion gyromagn. ratio over 2 pi 32.434 1015 0.000 0028 MHz T-1 Alpha particle mass 6.644 6565e-27 0.000 0011e-27 kg Alpha particle mass in u 4.001 506 179 149 0.000 000 000 056 u Alpha particle mass energy equivalent 5.971 9194e-10 0.000 0010e-10 J Alpha particle mass energy equivalent in MeV 3727.379 17 0.000 32 MeV Alpha particle-electron mass ratio 7294.299 5363 0.000 0032 Alpha particle-proton mass ratio 3.972 599 689 07 0.000 000 000 52 Alpha particle molar mass 4.001 506 179 149e-3 0.000 000 000 056e-3 kg mol-1 Avogadro constant 6.022 1415e23 0.000 0010e23 mol-1 Atomic mass constant 1.660 538 86e-27 0.000 000 28e-27 kg Atomic mass constant energy equivalent 1.492 417 90e-10 0.000 000 26e-10 J Atomic mass constant energy equivalent in MeV 931.494 043 0.000 080 MeV Faraday constant 96 485.3383 0.0083 C mol-1 Faraday constant for conventional electric current 96 485.336 0.016 C_90 mol-1 Molar Planck constant 3.990 312 716e-10 0.000 000 027e-10 J s mol-1 Molar Planck constant times c 0.119 626 565 72 0.000 000 000 80 J m mol-1 Molar gas constant 8.314 472 0.000 015 J mol-1 K-1 Boltzmann constant 1.380 6505e-23 0.000 0024e-23 J K-1 Boltzmann constant in eV/K 8.617 343e-5 0.000 015e-5 eV K-1 Boltzmann constant in Hz/K 2.083 6644e10 0.000 0036e10 Hz K-1 Boltzmann constant in inverse meters per kelvin 69.503 56 0.000 12 m-1 K-1 Molar volume of ideal gas (273.15 K, 101.325 kPa) 22.413 996e-3 0.000 039e-3 m3 mol-1 Loschmidt constant (273.15 K, 101.325 kPa) 2.686 7773e25 0.000 0047e25 m-3 Molar volume of ideal gas (273.15 K, 100 kPa) 22.710 981e-3 0.000 040e-3 m3 mol-1 Sackur-Tetrode constant (1 K, 100 kPa) -1.151 7047 0.000 0044 Sackur-Tetrode constant (1 K, 101.325 kPa) -1.164 8677 0.000 0044 Stefan-Boltzmann constant 5.670 400e-8 0.000 040e-8 W m-2 K-4 First radiation constant 3.741 771 38e-16 0.000 000 64e-16 W m2 First radiation constant for spectral radiance 1.191 042 82e-16 0.000 000 20e-16 W m2 sr-1 Second radiation constant 1.438 7752e-2 0.000 0025e-2 m K Wien Displacement law constant 2.897 7685e-3 0.000 0051e-3 m K Molar mass of carbon-12 12e-3 (exact) kg mol-1 Molar mass constant 1e-3 (exact) kg mol-1 Conventional value of Josephson constant 483 597.9e9 (exact) Hz V-1 Conventional value of von Klitzing constant 25 812.807 (exact) ohm Standard atmosphere 101 325 (exact) Pa Standard acceleration of gravity 9.806 65 (exact) m s-2 Cu X Unit 1.002 077 10e-13 0.000 000 29e-13 m Mo X Unit 1.002 099 66e-13 0.000 000 53e-13 m Angstrom star 1.000 015 09e-10 0.000 000 90e-10 m Lattice parameter of silicon 543.102 122e-12 0.000 020e-12 m {220} lattice spacing of silicon 192.015 5965e-12 0.000 0070e-12 m Molar volume of silicon 12.058 8382e-6 0.000 0024e-6 m3 mol-1 Electron volt 1.602 176 53e-19 0.000 000 14e-19 J Unified atomic mass unit 1.660 538 86e-27 0.000 000 28e-27 kg Natural unit of velocity 299 792 458 (exact) m s-1 Natural unit of action 1.054 571 68e-34 0.000 000 18e-34 J s Natural unit of action in eV s 6.582 119 15e-16 0.000 000 56e-16 eV s Natural unit of mass 9.109 3826e-31 0.000 0016e-31 kg Natural unit of energy 8.187 1047e-14 0.000 0014e-14 J Natural unit of energy in MeV 0.510 998 918 0.000 000 044 MeV Natural unit of momentum 2.730 924 19e-22 0.000 000 47e-22 kg m s-1 Natural unit of momentum in MeV/c 0.510 998 918 0.000 000 044 MeV/c Natural unit of length 386.159 2678e-15 0.000 0026e-15 m Natural unit of time 1.288 088 6677e-21 0.000 000 0086e-21 s Atomic unit of charge 1.602 176 53e-19 0.000 000 14e-19 C Atomic unit of mass 9.109 3826e-31 0.000 0016e-31 kg Atomic unit of action 1.054 571 68e-34 0.000 000 18e-34 J s Atomic unit of length 0.529 177 2108e-10 0.000 000 0018e-10 m Atomic unit of energy 4.359 744 17e-18 0.000 000 75e-18 J Atomic unit of time 2.418 884 326 505e-17 0.000 000 000 016e-17 s Atomic unit of force 8.238 7225e-8 0.000 0014e-8 N Atomic unit of velocity 2.187 691 2633e6 0.000 000 0073e6 m s-1 Atomic unit of momentum 1.992 851 66e-24 0.000 000 34e-24 kg m s-1 Atomic unit of current 6.623 617 82e-3 0.000 000 57e-3 A Atomic unit of charge density 1.081 202 317e12 0.000 000 093e12 C m-3 Atomic unit of electric potential 27.211 3845 0.000 0023 V Atomic unit of electric field 5.142 206 42e11 0.000 000 44e11 V m-1 Atomic unit of electric field gradient 9.717 361 82e21 0.000 000 83e21 V m-2 Atomic unit of electric dipole moment 8.478 353 09e-30 0.000 000 73e-30 C m Atomic unit of electric quadrupole moment 4.486 551 24e-40 0.000 000 39e-40 C m2 Atomic unit of electric polarizablity 1.648 777 274e-41 0.000 000 016e-41 C2 m2 J-1 Atomic unit of 1st hyperpolarizablity 3.206 361 51e-53 0.000 000 28e-53 C3 m3 J-2 Atomic unit of 2nd hyperpolarizablity 6.235 3808e-65 0.000 0011e-65 C4 m4 J-3 Atomic unit of magn. flux density 2.350 517 42e5 0.000 000 20e5 T Atomic unit of magn. dipole moment 1.854 801 90e-23 0.000 000 16e-23 J T-1 Atomic unit of magnetizability 7.891 036 60e-29 0.000 000 13e-29 J T-2 Atomic unit of permittivity 1.112 650 056...e-10 (exact) F m-1 Joule-kilogram relationship 1.112 650 056...e-17 (exact) kg Joule-inverse meter relationship 5.034 117 20e24 0.000 000 86e24 m-1 Joule-hertz relationship 1.509 190 37e33 0.000 000 26e33 Hz Joule-kelvin relationship 7.242 963e22 0.000 013e22 K Joule-electron volt relationship 6.241 509 47e18 0.000 000 53e18 eV Joule-atomic mass unit relationship 6.700 5361e9 0.000 0011e9 u Joule-hartree relationship 2.293 712 57e17 0.000 000 39e17 E_h Kilogram-joule relationship 8.987 551 787...e16 (exact) J Kilogram-inverse meter relationship 4.524 438 91e41 0.000 000 77e41 m-1 Kilogram-hertz relationship 1.356 392 66e50 0.000 000 23e50 Hz Kilogram-kelvin relationship 6.509 650e39 0.000 011e39 K Kilogram-electron volt relationship 5.609 588 96e35 0.000 000 48e35 eV Kilogram-atomic mass unit relationship 6.022 1415e26 0.000 0010e26 u Kilogram-hartree relationship 2.061 486 05e34 0.000 000 35e34 E_h Inverse meter-joule relationship 1.986 445 61e-25 0.000 000 34e-25 J Inverse meter-kilogram relationship 2.210 218 81e-42 0.000 000 38e-42 kg Inverse meter-hertz relationship 299 792 458 (exact) Hz Inverse meter-kelvin relationship 1.438 7752e-2 0.000 0025e-2 K Inverse meter-electron volt relationship 1.239 841 91e-6 0.000 000 11e-6 eV Inverse meter-atomic mass unit relationship 1.331 025 0506e-15 0.000 000 0089e-15 u Inverse meter-hartree relationship 4.556 335 252 760e-8 0.000 000 000 030e-8 E_h Hertz-joule relationship 6.626 0693e-34 0.000 0011e-34 J Hertz-kilogram relationship 7.372 4964e-51 0.000 0013e-51 kg Hertz-inverse meter relationship 3.335 640 951...e-9 (exact) m-1 Hertz-kelvin relationship 4.799 2374e-11 0.000 0084e-11 K Hertz-electron volt relationship 4.135 667 43e-15 0.000 000 35e-15 eV Hertz-atomic mass unit relationship 4.439 821 667e-24 0.000 000 030e-24 u Hertz-hartree relationship 1.519 829 846 006e-16 0.000 000 000 010e-16 E_h Kelvin-joule relationship 1.380 6505e-23 0.000 0024e-23 J Kelvin-kilogram relationship 1.536 1808e-40 0.000 0027e-40 kg Kelvin-inverse meter relationship 69.503 56 0.000 12 m-1 Kelvin-hertz relationship 2.083 6644e10 0.000 0036e10 Hz Kelvin-electron volt relationship 8.617 343e-5 0.000 015e-5 eV Kelvin-atomic mass unit relationship 9.251 098e-14 0.000 016e-14 u Kelvin-hartree relationship 3.166 8153e-6 0.000 0055e-6 E_h Electron volt-joule relationship 1.602 176 53e-19 0.000 000 14e-19 J Electron volt-kilogram relationship 1.782 661 81e-36 0.000 000 15e-36 kg Electron volt-inverse meter relationship 8.065 544 45e5 0.000 000 69e5 m-1 Electron volt-hertz relationship 2.417 989 40e14 0.000 000 21e14 Hz Electron volt-kelvin relationship 1.160 4505e4 0.000 0020e4 K Electron volt-atomic mass unit relationship 1.073 544 171e-9 0.000 000 092e-9 u Electron volt-hartree relationship 3.674 932 45e-2 0.000 000 31e-2 E_h Atomic mass unit-joule relationship 1.492 417 90e-10 0.000 000 26e-10 J Atomic mass unit-kilogram relationship 1.660 538 86e-27 0.000 000 28e-27 kg Atomic mass unit-inverse meter relationship 7.513 006 608e14 0.000 000 050e14 m-1 Atomic mass unit-hertz relationship 2.252 342 718e23 0.000 000 015e23 Hz Atomic mass unit-kelvin relationship 1.080 9527e13 0.000 0019e13 K Atomic mass unit-electron volt relationship 931.494 043e6 0.000 080e6 eV Atomic mass unit-hartree relationship 3.423 177 686e7 0.000 000 023e7 E_h Hartree-joule relationship 4.359 744 17e-18 0.000 000 75e-18 J Hartree-kilogram relationship 4.850 869 60e-35 0.000 000 83e-35 kg Hartree-inverse meter relationship 2.194 746 313 705e7 0.000 000 000 015e7 m-1 Hartree-hertz relationship 6.579 683 920 721e15 0.000 000 000 044e15 Hz Hartree-kelvin relationship 3.157 7465e5 0.000 0055e5 K Hartree-electron volt relationship 27.211 3845 0.000 0023 eV Hartree-atomic mass unit relationship 2.921 262 323e-8 0.000 000 019e-8 u