quantity value uncertainty relative_uncertainty unit exact value_text uncertainty_text Angstrom star 1.00001495e-10 9e-17 9e-7 m false 1.000 014 95 e-10 0.000 000 90 e-10 Avogadro constant 6.02214076e+23 0 0 mol^-1 true 6.022 140 76 e23 (exact) Bohr magneton 9.2740100657e-24 2.9e-33 3.1e-10 J T^-1 false 9.274 010 0657 e-24 0.000 000 0029 e-24 Bohr magneton in Hz/T 13996244917.1 4.4 3.1e-10 Hz T^-1 false 1.399 624 491 71 e10 0.000 000 000 44 e10 Bohr magneton in K/T 0.67171381472 2.1e-10 3.1e-10 K T^-1 false 0.671 713 814 72 0.000 000 000 21 Bohr magneton in eV/T 0.000057883817982 1.8e-14 3.1e-10 eV T^-1 false 5.788 381 7982 e-5 0.000 000 0018 e-5 Bohr magneton in inverse meter per tesla 46.686447719 1.5e-8 3.2e-10 m^-1 T^-1 false 46.686 447 719 0.000 000 015 Bohr radius 5.29177210544e-11 8.2e-21 1.5e-10 m false 5.291 772 105 44 e-11 0.000 000 000 82 e-11 Boltzmann constant 1.380649e-23 0 0 J K^-1 true 1.380 649 e-23 (exact) Boltzmann constant in Hz/K 20836619120 0 0 Hz K^-1 true 2.083 661 912... e10 (exact) Boltzmann constant in eV/K 0.00008617333262 0 0 eV K^-1 true 8.617 333 262... e-5 (exact) Boltzmann constant in inverse meter per kelvin 69.50348004 0 0 m^-1 K^-1 true 69.503 480 04... (exact) Compton wavelength 2.42631023538e-12 7.6e-22 3.1e-10 m false 2.426 310 235 38 e-12 0.000 000 000 76 e-12 Copper x unit 1.00207697e-13 2.8e-20 2.8e-7 m false 1.002 076 97 e-13 0.000 000 28 e-13 Faraday constant 96485.33212 0 0 C mol^-1 true 96 485.332 12... (exact) Fermi coupling constant 0.000011663787 6e-12 5.1e-7 GeV^-2 false 1.166 3787 e-5 0.000 0006 e-5 Hartree energy 4.359744722206e-18 4.8e-30 1.1e-12 J false 4.359 744 722 2060 e-18 0.000 000 000 0048 e-18 Hartree energy in eV 27.211386245981 3e-11 1.1e-12 eV false 27.211 386 245 981 0.000 000 000 030 Josephson constant 483597848400000 0 0 Hz V^-1 true 483 597.848 4... e9 (exact) Loschmidt constant (273.15 K, 100 kPa) 2.651645804e+25 0 0 m^-3 true 2.651 645 804... e25 (exact) Loschmidt constant (273.15 K, 101.325 kPa) 2.686780111e+25 0 0 m^-3 true 2.686 780 111... e25 (exact) Molybdenum x unit 1.00209952e-13 5.3e-20 5.3e-7 m false 1.002 099 52 e-13 0.000 000 53 e-13 Newtonian constant of gravitation 6.6743e-11 1.5e-15 0.000022 m^3 kg^-1 s^-2 false 6.674 30 e-11 0.000 15 e-11 Newtonian constant of gravitation over h-bar c 6.70883e-39 1.5e-43 0.000022 (GeV/c^2)^-2 false 6.708 83 e-39 0.000 15 e-39 Planck constant 6.62607015e-34 0 0 J Hz^-1 true 6.626 070 15 e-34 (exact) Planck constant in eV/Hz 4.135667696e-15 0 0 eV Hz^-1 true 4.135 667 696... e-15 (exact) Planck length 1.616255e-35 1.8e-40 0.000011 m false 1.616 255 e-35 0.000 018 e-35 Planck mass 2.176434e-8 2.4e-13 0.000011 kg false 2.176 434 e-8 0.000 024 e-8 Planck mass energy equivalent in GeV 12208900000000000000 140000000000000 0.000011 GeV false 1.220 890 e19 0.000 014 e19 Planck temperature 1.416784e+32 1.6e+27 0.000011 K false 1.416 784 e32 0.000 016 e32 Planck time 5.391247e-44 6e-49 0.000011 s false 5.391 247 e-44 0.000 060 e-44 Rydberg constant 10973731.568157 0.000012 1.1e-12 m^-1 false 10 973 731.568 157 0.000 012 Rydberg constant times c in Hz 3289841960250000 3600 1.1e-12 Hz false 3.289 841 960 2500 e15 0.000 000 000 0036 e15 Rydberg constant times hc in J 2.179872361103e-18 2.4e-30 1.1e-12 J false 2.179 872 361 1030 e-18 0.000 000 000 0024 e-18 Rydberg constant times hc in eV 13.60569312299 1.5e-11 1.1e-12 eV false 13.605 693 122 990 0.000 000 000 015 Sackur-Tetrode constant (1 K, 100 kPa) -1.15170753496 4.7e-10 4.1e-10 false -1.151 707 534 96 0.000 000 000 47 Sackur-Tetrode constant (1 K, 101.325 kPa) -1.16487052149 4.7e-10 4e-10 false -1.164 870 521 49 0.000 000 000 47 Stefan-Boltzmann constant 5.670374419e-8 0 0 W m^-2 K^-4 true 5.670 374 419... e-8 (exact) Thomson cross section 6.6524587051e-29 6.2e-38 9.3e-10 m^2 false 6.652 458 7051 e-29 0.000 000 0062 e-29 W to Z mass ratio 0.88145 0.00013 0.00015 false 0.881 45 0.000 13 Wien frequency displacement law constant 58789257570 0 0 Hz K^-1 true 5.878 925 757... e10 (exact) Wien wavelength displacement law constant 0.002897771955 0 0 m K true 2.897 771 955... e-3 (exact) alpha particle mass 6.644657345e-27 2.1e-36 3.2e-10 kg false 6.644 657 3450 e-27 0.000 000 0021 e-27 alpha particle mass energy equivalent 5.9719201997e-10 1.9e-19 3.2e-10 J false 5.971 920 1997 e-10 0.000 000 0019 e-10 alpha particle mass energy equivalent in MeV 3727.3794118 0.0000012 3.2e-10 MeV false 3727.379 4118 0.000 0012 alpha particle mass in u 4.001506179129 6.2e-11 1.5e-11 u false 4.001 506 179 129 0.000 000 000 062 alpha particle molar mass 0.0040015061833 1.2e-12 3e-10 kg mol^-1 false 4.001 506 1833 e-3 0.000 000 0012 e-3 alpha particle relative atomic mass 4.001506179129 6.2e-11 1.5e-11 false 4.001 506 179 129 0.000 000 000 062 alpha particle rms charge radius 1.6785e-15 2.1e-18 0.0013 m false 1.6785 e-15 0.0021 e-15 alpha particle-electron mass ratio 7294.29954171 1.7e-7 2.3e-11 false 7294.299 541 71 0.000 000 17 alpha particle-proton mass ratio 3.972599690252 7e-11 1.8e-11 false 3.972 599 690 252 0.000 000 000 070 atomic mass constant 1.66053906892e-27 5.2e-37 3.1e-10 kg false 1.660 539 068 92 e-27 0.000 000 000 52 e-27 atomic mass constant energy equivalent 1.49241808768e-10 4.6e-20 3.1e-10 J false 1.492 418 087 68 e-10 0.000 000 000 46 e-10 atomic mass constant energy equivalent in MeV 931.49410372 2.9e-7 3.1e-10 MeV false 931.494 103 72 0.000 000 29 atomic mass unit-electron volt relationship 931494103.72 0.29 3.1e-10 eV false 9.314 941 0372 e8 0.000 000 0029 e8 atomic mass unit-hartree relationship 34231776.922 0.011 3.2e-10 E_h false 3.423 177 6922 e7 0.000 000 0011 e7 atomic mass unit-hertz relationship 2.25234272185e+23 70000000000000 3.1e-10 Hz false 2.252 342 721 85 e23 0.000 000 000 70 e23 atomic mass unit-inverse meter relationship 751300662090000 230000 3.1e-10 m^-1 false 7.513 006 6209 e14 0.000 000 0023 e14 atomic mass unit-joule relationship 1.49241808768e-10 4.6e-20 3.1e-10 J false 1.492 418 087 68 e-10 0.000 000 000 46 e-10 atomic mass unit-kelvin relationship 10809540206700 3400 3.1e-10 K false 1.080 954 020 67 e13 0.000 000 000 34 e13 atomic mass unit-kilogram relationship 1.66053906892e-27 5.2e-37 3.1e-10 kg false 1.660 539 068 92 e-27 0.000 000 000 52 e-27 atomic unit of 1st hyperpolarizability 3.2063612996e-53 1.5e-62 4.7e-10 C^3 m^3 J^-2 false 3.206 361 2996 e-53 0.000 000 0015 e-53 atomic unit of 2nd hyperpolarizability 6.2353799735e-65 3.9e-74 6.3e-10 C^4 m^4 J^-3 false 6.235 379 9735 e-65 0.000 000 0039 e-65 atomic unit of action 1.054571817e-34 0 0 J s true 1.054 571 817... e-34 (exact) atomic unit of charge 1.602176634e-19 0 0 C true 1.602 176 634 e-19 (exact) atomic unit of charge density 1081202386770 510 4.7e-10 C m^-3 false 1.081 202 386 77 e12 0.000 000 000 51 e12 atomic unit of current 0.0066236182375082 7.2e-15 1.1e-12 A false 6.623 618 237 5082 e-3 0.000 000 000 0072 e-3 atomic unit of electric dipole mom. 8.4783536198e-30 1.3e-39 1.5e-10 C m false 8.478 353 6198 e-30 0.000 000 0013 e-30 atomic unit of electric field 514220675112 80 1.6e-10 V m^-1 false 5.142 206 751 12 e11 0.000 000 000 80 e11 atomic unit of electric field gradient 9.7173624424e+21 3000000000000 3.1e-10 V m^-2 false 9.717 362 4424 e21 0.000 000 0030 e21 atomic unit of electric polarizability 1.64877727212e-41 5.1e-51 3.1e-10 C^2 m^2 J^-1 false 1.648 777 272 12 e-41 0.000 000 000 51 e-41 atomic unit of electric potential 27.211386245981 3e-11 1.1e-12 V false 27.211 386 245 981 0.000 000 000 030 atomic unit of electric quadrupole mom. 4.4865515185e-40 1.4e-49 3.1e-10 C m^2 false 4.486 551 5185 e-40 0.000 000 0014 e-40 atomic unit of energy 4.359744722206e-18 4.8e-30 1.1e-12 J false 4.359 744 722 2060 e-18 0.000 000 000 0048 e-18 atomic unit of force 8.2387235038e-8 1.3e-17 1.6e-10 N false 8.238 723 5038 e-8 0.000 000 0013 e-8 atomic unit of length 5.29177210544e-11 8.2e-21 1.5e-10 m false 5.291 772 105 44 e-11 0.000 000 000 82 e-11 atomic unit of mag. dipole mom. 1.85480201315e-23 5.8e-33 3.1e-10 J T^-1 false 1.854 802 013 15 e-23 0.000 000 000 58 e-23 atomic unit of mag. flux density 235051.757077 0.000073 3.1e-10 T false 2.350 517 570 77 e5 0.000 000 000 73 e5 atomic unit of magnetizability 7.8910365794e-29 4.9e-38 6.2e-10 J T^-2 false 7.891 036 5794 e-29 0.000 000 0049 e-29 atomic unit of mass 9.1093837139e-31 2.8e-40 3.1e-10 kg false 9.109 383 7139 e-31 0.000 000 0028 e-31 atomic unit of momentum 1.99285191545e-24 3.1e-34 1.6e-10 kg m s^-1 false 1.992 851 915 45 e-24 0.000 000 000 31 e-24 atomic unit of permittivity 1.1126500562e-10 1.7e-20 1.5e-10 F m^-1 false 1.112 650 056 20 e-10 0.000 000 000 17 e-10 atomic unit of time 2.4188843265864e-17 2.6e-29 1.1e-12 s false 2.418 884 326 5864 e-17 0.000 000 000 0026 e-17 atomic unit of velocity 2187691.26216 0.00034 1.6e-10 m s^-1 false 2.187 691 262 16 e6 0.000 000 000 34 e6 characteristic impedance of vacuum 376.730313412 5.9e-8 1.6e-10 ohm false 376.730 313 412 0.000 000 059 classical electron radius 2.8179403205e-15 1.3e-24 4.6e-10 m false 2.817 940 3205 e-15 0.000 000 0013 e-15 conductance quantum 0.00007748091729 0 0 S true 7.748 091 729... e-5 (exact) conventional value of Josephson constant 483597900000000 0 0 Hz V^-1 true 483 597.9 e9 (exact) conventional value of ampere-90 1.00000008887 0 0 A true 1.000 000 088 87... (exact) conventional value of coulomb-90 1.00000008887 0 0 C true 1.000 000 088 87... (exact) conventional value of farad-90 0.9999999822 0 0 F true 0.999 999 982 20... (exact) conventional value of henry-90 1.00000001779 0 0 H true 1.000 000 017 79... (exact) conventional value of ohm-90 1.00000001779 0 0 ohm true 1.000 000 017 79... (exact) conventional value of volt-90 1.00000010666 0 0 V true 1.000 000 106 66... (exact) conventional value of von Klitzing constant 25812.807 0 0 ohm true 25 812.807 (exact) conventional value of watt-90 1.00000019553 0 0 W true 1.000 000 195 53... (exact) deuteron g factor 0.8574382335 2.2e-9 2.6e-9 false 0.857 438 2335 0.000 000 0022 deuteron mag. mom. 4.330735087e-27 1.1e-35 2.5e-9 J T^-1 false 4.330 735 087 e-27 0.000 000 011 e-27 deuteron mag. mom. to Bohr magneton ratio 0.0004669754568 1.2e-12 2.6e-9 false 4.669 754 568 e-4 0.000 000 012 e-4 deuteron mag. mom. to nuclear magneton ratio 0.8574382335 2.2e-9 2.6e-9 false 0.857 438 2335 0.000 000 0022 deuteron mass 3.3435837768e-27 1e-36 3e-10 kg false 3.343 583 7768 e-27 0.000 000 0010 e-27 deuteron mass energy equivalent 3.00506323491e-10 9.4e-20 3.1e-10 J false 3.005 063 234 91 e-10 0.000 000 000 94 e-10 deuteron mass energy equivalent in MeV 1875.612945 5.8e-7 3.1e-10 MeV false 1875.612 945 00 0.000 000 58 deuteron mass in u 2.013553212544 1.5e-11 7.4e-12 u false 2.013 553 212 544 0.000 000 000 015 deuteron molar mass 0.00201355321466 6.3e-13 3.1e-10 kg mol^-1 false 2.013 553 214 66 e-3 0.000 000 000 63 e-3 deuteron relative atomic mass 2.013553212544 1.5e-11 7.4e-12 false 2.013 553 212 544 0.000 000 000 015 deuteron rms charge radius 2.12778e-15 2.7e-19 0.00013 m false 2.127 78 e-15 0.000 27 e-15 deuteron-electron mag. mom. ratio -0.000466434555 1.2e-12 2.6e-9 false -4.664 345 550 e-4 0.000 000 012 e-4 deuteron-electron mass ratio 3670.482967655 6.3e-8 1.7e-11 false 3670.482 967 655 0.000 000 063 deuteron-neutron mag. mom. ratio -0.44820652 1.1e-7 2.5e-7 false -0.448 206 52 0.000 000 11 deuteron-proton mag. mom. ratio 0.3070122093 7.9e-10 2.6e-9 false 0.307 012 209 30 0.000 000 000 79 deuteron-proton mass ratio 1.9990075012699 8.4e-12 4.2e-12 false 1.999 007 501 2699 0.000 000 000 0084 electron charge to mass quotient -175882000838 55 3.1e-10 C kg^-1 false -1.758 820 008 38 e11 0.000 000 000 55 e11 electron g factor -2.00231930436092 3.6e-13 1.8e-13 false -2.002 319 304 360 92 0.000 000 000 000 36 electron gyromag. ratio 176085962784 55 3.1e-10 s^-1 T^-1 false 1.760 859 627 84 e11 0.000 000 000 55 e11 electron gyromag. ratio in MHz/T 28024.9513861 0.0000087 3.1e-10 MHz T^-1 false 28 024.951 3861 0.000 0087 electron mag. mom. -9.2847646917e-24 2.9e-33 3.1e-10 J T^-1 false -9.284 764 6917 e-24 0.000 000 0029 e-24 electron mag. mom. anomaly 0.00115965218046 1.8e-13 1.6e-10 false 1.159 652 180 46 e-3 0.000 000 000 18 e-3 electron mag. mom. to Bohr magneton ratio -1.00115965218046 1.8e-13 1.8e-13 false -1.001 159 652 180 46 0.000 000 000 000 18 electron mag. mom. to nuclear magneton ratio -1838.281971877 3.2e-8 1.7e-11 false -1838.281 971 877 0.000 000 032 electron mass 9.1093837139e-31 2.8e-40 3.1e-10 kg false 9.109 383 7139 e-31 0.000 000 0028 e-31 electron mass energy equivalent 8.187105788e-14 2.6e-23 3.2e-10 J false 8.187 105 7880 e-14 0.000 000 0026 e-14 electron mass energy equivalent in MeV 0.51099895069 1.6e-10 3.1e-10 MeV false 0.510 998 950 69 0.000 000 000 16 electron mass in u 0.0005485799090441 9.7e-15 1.8e-11 u false 5.485 799 090 441 e-4 0.000 000 000 097 e-4 electron molar mass 5.4857990962e-7 1.7e-16 3.1e-10 kg mol^-1 false 5.485 799 0962 e-7 0.000 000 0017 e-7 electron relative atomic mass 0.0005485799090441 9.7e-15 1.8e-11 false 5.485 799 090 441 e-4 0.000 000 000 097 e-4 electron to alpha particle mass ratio 0.0001370933554733 3.2e-15 2.3e-11 false 1.370 933 554 733 e-4 0.000 000 000 032 e-4 electron to shielded helion mag. mom. ratio 864.05823986 7e-7 8.1e-10 false 864.058 239 86 0.000 000 70 electron to shielded proton mag. mom. ratio -658.2275856 0.0000027 4.1e-9 false -658.227 5856 0.000 0027 electron volt 1.602176634e-19 0 0 J true 1.602 176 634 e-19 (exact) electron volt-atomic mass unit relationship 1.07354410083e-9 3.3e-19 3.1e-10 u false 1.073 544 100 83 e-9 0.000 000 000 33 e-9 electron volt-hartree relationship 0.036749322175665 4e-14 1.1e-12 E_h false 3.674 932 217 5665 e-2 0.000 000 000 0040 e-2 electron volt-hertz relationship 241798924200000 0 0 Hz true 2.417 989 242... e14 (exact) electron volt-inverse meter relationship 806554.3937 0 0 m^-1 true 8.065 543 937... e5 (exact) electron volt-joule relationship 1.602176634e-19 0 0 J true 1.602 176 634 e-19 (exact) electron volt-kelvin relationship 11604.51812 0 0 K true 1.160 451 812... e4 (exact) electron volt-kilogram relationship 1.782661921e-36 0 0 kg true 1.782 661 921... e-36 (exact) electron-deuteron mag. mom. ratio -2143.9234921 0.0000056 2.6e-9 false -2143.923 4921 0.000 0056 electron-deuteron mass ratio 0.0002724437107629 4.7e-15 1.7e-11 false 2.724 437 107 629 e-4 0.000 000 000 047 e-4 electron-helion mass ratio 0.0001819543074649 5.3e-15 2.9e-11 false 1.819 543 074 649 e-4 0.000 000 000 053 e-4 electron-muon mag. mom. ratio 206.7669881 0.0000046 2.2e-8 false 206.766 9881 0.000 0046 electron-muon mass ratio 0.0048363317 1.1e-10 2.3e-8 false 4.836 331 70 e-3 0.000 000 11 e-3 electron-neutron mag. mom. ratio 960.92048 0.00023 2.4e-7 false 960.920 48 0.000 23 electron-neutron mass ratio 0.00054386734416 2.2e-13 4e-10 false 5.438 673 4416 e-4 0.000 000 0022 e-4 electron-proton mag. mom. ratio -658.21068789 1.9e-7 2.9e-10 false -658.210 687 89 0.000 000 19 electron-proton mass ratio 0.0005446170214889 9.4e-15 1.7e-11 false 5.446 170 214 889 e-4 0.000 000 000 094 e-4 electron-tau mass ratio 0.000287585 1.9e-8 0.000066 false 2.875 85 e-4 0.000 19 e-4 electron-triton mass ratio 0.0001819200062327 6.8e-15 3.7e-11 false 1.819 200 062 327 e-4 0.000 000 000 068 e-4 elementary charge 1.602176634e-19 0 0 C true 1.602 176 634 e-19 (exact) elementary charge over h-bar 1519267447000000 0 0 A J^-1 true 1.519 267 447... e15 (exact) fine-structure constant 0.0072973525643 1.1e-12 1.5e-10 false 7.297 352 5643 e-3 0.000 000 0011 e-3 first radiation constant 3.741771852e-16 0 0 W m^2 true 3.741 771 852... e-16 (exact) first radiation constant for spectral radiance 1.191042972e-16 0 0 W m^2 sr^-1 true 1.191 042 972... e-16 (exact) hartree-atomic mass unit relationship 2.92126231797e-8 9.1e-18 3.1e-10 u false 2.921 262 317 97 e-8 0.000 000 000 91 e-8 hartree-electron volt relationship 27.211386245981 3e-11 1.1e-12 eV false 27.211 386 245 981 0.000 000 000 030 hartree-hertz relationship 6579683920499900 7200 1.1e-12 Hz false 6.579 683 920 4999 e15 0.000 000 000 0072 e15 hartree-inverse meter relationship 21947463.136314 0.000024 1.1e-12 m^-1 false 2.194 746 313 6314 e7 0.000 000 000 0024 e7 hartree-joule relationship 4.359744722206e-18 4.8e-30 1.1e-12 J false 4.359 744 722 2060 e-18 0.000 000 000 0048 e-18 hartree-kelvin relationship 315775.02480398 3.4e-7 1.1e-12 K false 3.157 750 248 0398 e5 0.000 000 000 0034 e5 hartree-kilogram relationship 4.8508702095419e-35 5.3e-47 1.1e-12 kg false 4.850 870 209 5419 e-35 0.000 000 000 0053 e-35 helion g factor -4.2552506995 3.4e-9 8e-10 false -4.255 250 6995 0.000 000 0034 helion mag. mom. -1.07461755198e-26 9.3e-36 8.7e-10 J T^-1 false -1.074 617 551 98 e-26 0.000 000 000 93 e-26 helion mag. mom. to Bohr magneton ratio -0.00115874098083 9.4e-13 8.1e-10 false -1.158 740 980 83 e-3 0.000 000 000 94 e-3 helion mag. mom. to nuclear magneton ratio -2.1276253498 1.7e-9 8e-10 false -2.127 625 3498 0.000 000 0017 helion mass 5.0064127862e-27 1.6e-36 3.2e-10 kg false 5.006 412 7862 e-27 0.000 000 0016 e-27 helion mass energy equivalent 4.4995394185e-10 1.4e-19 3.1e-10 J false 4.499 539 4185 e-10 0.000 000 0014 e-10 helion mass energy equivalent in MeV 2808.39161112 8.8e-7 3.1e-10 MeV false 2808.391 611 12 0.000 000 88 helion mass in u 3.014932246932 7.4e-11 2.5e-11 u false 3.014 932 246 932 0.000 000 000 074 helion molar mass 0.0030149322501 9.4e-13 3.1e-10 kg mol^-1 false 3.014 932 250 10 e-3 0.000 000 000 94 e-3 helion relative atomic mass 3.014932246932 7.4e-11 2.5e-11 false 3.014 932 246 932 0.000 000 000 074 helion shielding shift 0.000059967029 2.3e-11 3.8e-7 false 5.996 7029 e-5 0.000 0023 e-5 helion-electron mass ratio 5495.88527984 1.6e-7 2.9e-11 false 5495.885 279 84 0.000 000 16 helion-proton mass ratio 2.993152671552 7e-11 2.3e-11 false 2.993 152 671 552 0.000 000 000 070 hertz-atomic mass unit relationship 4.439821659e-24 1.4e-33 3.2e-10 u false 4.439 821 6590 e-24 0.000 000 0014 e-24 hertz-electron volt relationship 4.135667696e-15 0 0 eV true 4.135 667 696... e-15 (exact) hertz-hartree relationship 1.5198298460574e-16 1.7e-28 1.1e-12 E_h false 1.519 829 846 0574 e-16 0.000 000 000 0017 e-16 hertz-inverse meter relationship 3.335640951e-9 0 0 m^-1 true 3.335 640 951... e-9 (exact) hertz-joule relationship 6.62607015e-34 0 0 J true 6.626 070 15 e-34 (exact) hertz-kelvin relationship 4.799243073e-11 0 0 K true 4.799 243 073... e-11 (exact) hertz-kilogram relationship 7.372497323e-51 0 0 kg true 7.372 497 323... e-51 (exact) hyperfine transition frequency of Cs-133 9192631770 0 0 Hz true 9 192 631 770 (exact) inverse fine-structure constant 137.035999177 2.1e-8 1.5e-10 false 137.035 999 177 0.000 000 021 inverse meter-atomic mass unit relationship 1.33102504824e-15 4.1e-25 3.1e-10 u false 1.331 025 048 24 e-15 0.000 000 000 41 e-15 inverse meter-electron volt relationship 0.000001239841984 0 0 eV true 1.239 841 984... e-6 (exact) inverse meter-hartree relationship 4.5563352529132e-8 5e-20 1.1e-12 E_h false 4.556 335 252 9132 e-8 0.000 000 000 0050 e-8 inverse meter-hertz relationship 299792458 0 0 Hz true 299 792 458 (exact) inverse meter-joule relationship 1.986445857e-25 0 0 J true 1.986 445 857... e-25 (exact) inverse meter-kelvin relationship 0.01438776877 0 0 K true 1.438 776 877... e-2 (exact) inverse meter-kilogram relationship 2.210219094e-42 0 0 kg true 2.210 219 094... e-42 (exact) inverse of conductance quantum 12906.40372 0 0 ohm true 12 906.403 72... (exact) joule-atomic mass unit relationship 6700535247.1 2.1 3.1e-10 u false 6.700 535 2471 e9 0.000 000 0021 e9 joule-electron volt relationship 6241509074000000000 0 0 eV true 6.241 509 074... e18 (exact) joule-hartree relationship 229371227839690000 250000 1.1e-12 E_h false 2.293 712 278 3969 e17 0.000 000 000 0025 e17 joule-hertz relationship 1.509190179e+33 0 0 Hz true 1.509 190 179... e33 (exact) joule-inverse meter relationship 5.034116567e+24 0 0 m^-1 true 5.034 116 567... e24 (exact) joule-kelvin relationship 7.242970516e+22 0 0 K true 7.242 970 516... e22 (exact) joule-kilogram relationship 1.112650056e-17 0 0 kg true 1.112 650 056... e-17 (exact) kelvin-atomic mass unit relationship 9.2510872884e-14 2.9e-23 3.1e-10 u false 9.251 087 2884 e-14 0.000 000 0029 e-14 kelvin-electron volt relationship 0.00008617333262 0 0 eV true 8.617 333 262... e-5 (exact) kelvin-hartree relationship 0.0000031668115634564 3.5e-18 1.1e-12 E_h false 3.166 811 563 4564 e-6 0.000 000 000 0035 e-6 kelvin-hertz relationship 20836619120 0 0 Hz true 2.083 661 912... e10 (exact) kelvin-inverse meter relationship 69.50348004 0 0 m^-1 true 69.503 480 04... (exact) kelvin-joule relationship 1.380649e-23 0 0 J true 1.380 649 e-23 (exact) kelvin-kilogram relationship 1.536179187e-40 0 0 kg true 1.536 179 187... e-40 (exact) kilogram-atomic mass unit relationship 6.0221407537e+26 190000000000000000 3.2e-10 u false 6.022 140 7537 e26 0.000 000 0019 e26 kilogram-electron volt relationship 5.609588603e+35 0 0 eV true 5.609 588 603... e35 (exact) kilogram-hartree relationship 2.0614857887415e+34 2.2e+22 1.1e-12 E_h false 2.061 485 788 7415 e34 0.000 000 000 0022 e34 kilogram-hertz relationship 1.356392489e+50 0 0 Hz true 1.356 392 489... e50 (exact) kilogram-inverse meter relationship 4.524438335e+41 0 0 m^-1 true 4.524 438 335... e41 (exact) kilogram-joule relationship 89875517870000000 0 0 J true 8.987 551 787... e16 (exact) kilogram-kelvin relationship 6.50965726e+39 0 0 K true 6.509 657 260... e39 (exact) lattice parameter of silicon 5.431020511e-10 8.9e-18 1.6e-8 m false 5.431 020 511 e-10 0.000 000 089 e-10 lattice spacing of ideal Si (220) 1.920155716e-10 3.2e-18 1.7e-8 m false 1.920 155 716 e-10 0.000 000 032 e-10 luminous efficacy 683 0 0 lm W^-1 true 683 (exact) mag. flux quantum 2.067833848e-15 0 0 Wb true 2.067 833 848... e-15 (exact) molar Planck constant 3.990312712e-10 0 0 J Hz^-1 mol^-1 true 3.990 312 712... e-10 (exact) molar gas constant 8.314462618 0 0 J mol^-1 K^-1 true 8.314 462 618... (exact) molar mass constant 0.00100000000105 3.1e-13 3.1e-10 kg mol^-1 false 1.000 000 001 05 e-3 0.000 000 000 31 e-3 molar mass of carbon-12 0.0120000000126 3.7e-12 3.1e-10 kg mol^-1 false 12.000 000 0126 e-3 0.000 000 0037 e-3 molar volume of ideal gas (273.15 K, 100 kPa) 0.02271095464 0 0 m^3 mol^-1 true 22.710 954 64... e-3 (exact) molar volume of ideal gas (273.15 K, 101.325 kPa) 0.02241396954 0 0 m^3 mol^-1 true 22.413 969 54... e-3 (exact) molar volume of silicon 0.00001205883199 6e-13 5e-8 m^3 mol^-1 false 1.205 883 199 e-5 0.000 000 060 e-5 muon Compton wavelength 1.17344411e-14 2.6e-22 2.2e-8 m false 1.173 444 110 e-14 0.000 000 026 e-14 muon g factor -2.00233184123 8.2e-10 4.1e-10 false -2.002 331 841 23 0.000 000 000 82 muon mag. mom. -4.4904483e-26 1e-33 2.2e-8 J T^-1 false -4.490 448 30 e-26 0.000 000 10 e-26 muon mag. mom. anomaly 0.00116592062 4.1e-10 3.5e-7 false 1.165 920 62 e-3 0.000 000 41 e-3 muon mag. mom. to Bohr magneton ratio -0.00484197048 1.1e-10 2.3e-8 false -4.841 970 48 e-3 0.000 000 11 e-3 muon mag. mom. to nuclear magneton ratio -8.89059704 2e-7 2.2e-8 false -8.890 597 04 0.000 000 20 muon mass 1.883531627e-28 4.2e-36 2.2e-8 kg false 1.883 531 627 e-28 0.000 000 042 e-28 muon mass energy equivalent 1.692833804e-11 3.8e-19 2.2e-8 J false 1.692 833 804 e-11 0.000 000 038 e-11 muon mass energy equivalent in MeV 105.6583755 0.0000023 2.2e-8 MeV false 105.658 3755 0.000 0023 muon mass in u 0.1134289257 2.5e-9 2.2e-8 u false 0.113 428 9257 0.000 000 0025 muon molar mass 0.0001134289258 2.5e-12 2.2e-8 kg mol^-1 false 1.134 289 258 e-4 0.000 000 025 e-4 muon-electron mass ratio 206.7682827 0.0000046 2.2e-8 false 206.768 2827 0.000 0046 muon-neutron mass ratio 0.1124545168 2.5e-9 2.2e-8 false 0.112 454 5168 0.000 000 0025 muon-proton mag. mom. ratio -3.183345146 7.1e-8 2.2e-8 false -3.183 345 146 0.000 000 071 muon-proton mass ratio 0.1126095262 2.5e-9 2.2e-8 false 0.112 609 5262 0.000 000 0025 muon-tau mass ratio 0.0594635 0.000004 0.000067 false 5.946 35 e-2 0.000 40 e-2 natural unit of action 1.054571817e-34 0 0 J s true 1.054 571 817... e-34 (exact) natural unit of action in eV s 6.582119569e-16 0 0 eV s true 6.582 119 569... e-16 (exact) natural unit of energy 8.187105788e-14 2.6e-23 3.2e-10 J false 8.187 105 7880 e-14 0.000 000 0026 e-14 natural unit of energy in MeV 0.51099895069 1.6e-10 3.1e-10 MeV false 0.510 998 950 69 0.000 000 000 16 natural unit of length 3.8615926744e-13 1.2e-22 3.1e-10 m false 3.861 592 6744 e-13 0.000 000 0012 e-13 natural unit of mass 9.1093837139e-31 2.8e-40 3.1e-10 kg false 9.109 383 7139 e-31 0.000 000 0028 e-31 natural unit of momentum 2.73092453446e-22 8.5e-32 3.1e-10 kg m s^-1 false 2.730 924 534 46 e-22 0.000 000 000 85 e-22 natural unit of momentum in MeV/c 0.51099895069 1.6e-10 3.1e-10 MeV/c false 0.510 998 950 69 0.000 000 000 16 natural unit of time 1.28808866644e-21 4e-31 3.1e-10 s false 1.288 088 666 44 e-21 0.000 000 000 40 e-21 natural unit of velocity 299792458 0 0 m s^-1 true 299 792 458 (exact) neutron Compton wavelength 1.31959090382e-15 6.7e-25 5.1e-10 m false 1.319 590 903 82 e-15 0.000 000 000 67 e-15 neutron g factor -3.82608552 9e-7 2.4e-7 false -3.826 085 52 0.000 000 90 neutron gyromag. ratio 183247174 43 2.3e-7 s^-1 T^-1 false 1.832 471 74 e8 0.000 000 43 e8 neutron gyromag. ratio in MHz/T 29.1646935 0.0000069 2.4e-7 MHz T^-1 false 29.164 6935 0.000 0069 neutron mag. mom. -9.6623653e-27 2.3e-33 2.4e-7 J T^-1 false -9.662 3653 e-27 0.000 0023 e-27 neutron mag. mom. to Bohr magneton ratio -0.00104187565 2.5e-10 2.4e-7 false -1.041 875 65 e-3 0.000 000 25 e-3 neutron mag. mom. to nuclear magneton ratio -1.91304276 4.5e-7 2.4e-7 false -1.913 042 76 0.000 000 45 neutron mass 1.67492750056e-27 8.5e-37 5.1e-10 kg false 1.674 927 500 56 e-27 0.000 000 000 85 e-27 neutron mass energy equivalent 1.50534976514e-10 7.6e-20 5e-10 J false 1.505 349 765 14 e-10 0.000 000 000 76 e-10 neutron mass energy equivalent in MeV 939.56542194 4.8e-7 5.1e-10 MeV false 939.565 421 94 0.000 000 48 neutron mass in u 1.00866491606 4e-10 4e-10 u false 1.008 664 916 06 0.000 000 000 40 neutron molar mass 0.00100866491712 5.1e-13 5.1e-10 kg mol^-1 false 1.008 664 917 12 e-3 0.000 000 000 51 e-3 neutron relative atomic mass 1.00866491606 4e-10 4e-10 false 1.008 664 916 06 0.000 000 000 40 neutron to shielded proton mag. mom. ratio -0.68499694 1.6e-7 2.3e-7 false -0.684 996 94 0.000 000 16 neutron-electron mag. mom. ratio 0.00104066884 2.4e-10 2.3e-7 false 1.040 668 84 e-3 0.000 000 24 e-3 neutron-electron mass ratio 1838.683662 7.4e-7 4e-10 false 1838.683 662 00 0.000 000 74 neutron-muon mass ratio 8.89248408 2e-7 2.2e-8 false 8.892 484 08 0.000 000 20 neutron-proton mag. mom. ratio -0.68497935 1.6e-7 2.3e-7 false -0.684 979 35 0.000 000 16 neutron-proton mass difference 2.30557461e-30 6.7e-37 2.9e-7 kg false 2.305 574 61 e-30 0.000 000 67 e-30 neutron-proton mass difference energy equivalent 2.07214712e-13 6e-20 2.9e-7 J false 2.072 147 12 e-13 0.000 000 60 e-13 neutron-proton mass difference energy equivalent in MeV 1.29333251 3.8e-7 2.9e-7 MeV false 1.293 332 51 0.000 000 38 neutron-proton mass difference in u 0.00138844948 4e-10 2.9e-7 u false 1.388 449 48 e-3 0.000 000 40 e-3 neutron-proton mass ratio 1.00137841946 4e-10 4e-10 false 1.001 378 419 46 0.000 000 000 40 neutron-tau mass ratio 0.528779 0.000036 0.000068 false 0.528 779 0.000 036 nuclear magneton 5.0507837393e-27 1.6e-36 3.2e-10 J T^-1 false 5.050 783 7393 e-27 0.000 000 0016 e-27 nuclear magneton in K/T 0.00036582677706 1.1e-13 3e-10 K T^-1 false 3.658 267 7706 e-4 0.000 000 0011 e-4 nuclear magneton in MHz/T 7.6225932188 2.4e-9 3.1e-10 MHz T^-1 false 7.622 593 2188 0.000 000 0024 nuclear magneton in eV/T 3.15245125417e-8 9.8e-18 3.1e-10 eV T^-1 false 3.152 451 254 17 e-8 0.000 000 000 98 e-8 nuclear magneton in inverse meter per tesla 0.0254262341009 7.9e-12 3.1e-10 m^-1 T^-1 false 2.542 623 410 09 e-2 0.000 000 000 79 e-2 proton Compton wavelength 1.3214098536e-15 4.1e-25 3.1e-10 m false 1.321 409 853 60 e-15 0.000 000 000 41 e-15 proton charge to mass quotient 95788331.43 0.03 3.1e-10 C kg^-1 false 9.578 833 1430 e7 0.000 000 0030 e7 proton g factor 5.5856946893 1.6e-9 2.9e-10 false 5.585 694 6893 0.000 000 0016 proton gyromag. ratio 267522187.08 0.11 4.1e-10 s^-1 T^-1 false 2.675 221 8708 e8 0.000 000 0011 e8 proton gyromag. ratio in MHz/T 42.577478461 1.8e-8 4.2e-10 MHz T^-1 false 42.577 478 461 0.000 000 018 proton mag. mom. 1.41060679545e-26 6e-36 4.3e-10 J T^-1 false 1.410 606 795 45 e-26 0.000 000 000 60 e-26 proton mag. mom. to Bohr magneton ratio 0.0015210322023 4.5e-13 3e-10 false 1.521 032 202 30 e-3 0.000 000 000 45 e-3 proton mag. mom. to nuclear magneton ratio 2.79284734463 8.2e-10 2.9e-10 false 2.792 847 344 63 0.000 000 000 82 proton mag. shielding correction 0.0000256715 4.1e-9 0.00016 false 2.567 15 e-5 0.000 41 e-5 proton mass 1.67262192595e-27 5.2e-37 3.1e-10 kg false 1.672 621 925 95 e-27 0.000 000 000 52 e-27 proton mass energy equivalent 1.50327761802e-10 4.7e-20 3.1e-10 J false 1.503 277 618 02 e-10 0.000 000 000 47 e-10 proton mass energy equivalent in MeV 938.27208943 2.9e-7 3.1e-10 MeV false 938.272 089 43 0.000 000 29 proton mass in u 1.0072764665789 8.3e-12 8.2e-12 u false 1.007 276 466 5789 0.000 000 000 0083 proton molar mass 0.00100727646764 3.1e-13 3.1e-10 kg mol^-1 false 1.007 276 467 64 e-3 0.000 000 000 31 e-3 proton relative atomic mass 1.0072764665789 8.3e-12 8.2e-12 false 1.007 276 466 5789 0.000 000 000 0083 proton rms charge radius 8.4075e-16 6.4e-19 0.00076 m false 8.4075 e-16 0.0064 e-16 proton-electron mass ratio 1836.152673426 3.2e-8 1.7e-11 false 1836.152 673 426 0.000 000 032 proton-muon mass ratio 8.88024338 2e-7 2.3e-8 false 8.880 243 38 0.000 000 20 proton-neutron mag. mom. ratio -1.45989802 3.4e-7 2.3e-7 false -1.459 898 02 0.000 000 34 proton-neutron mass ratio 0.99862347797 4e-10 4e-10 false 0.998 623 477 97 0.000 000 000 40 proton-tau mass ratio 0.528051 0.000036 0.000068 false 0.528 051 0.000 036 quantum of circulation 0.00036369475467 1.1e-13 3e-10 m^2 s^-1 false 3.636 947 5467 e-4 0.000 000 0011 e-4 quantum of circulation times 2 0.00072738950934 2.3e-13 3.2e-10 m^2 s^-1 false 7.273 895 0934 e-4 0.000 000 0023 e-4 reduced Compton wavelength 3.8615926744e-13 1.2e-22 3.1e-10 m false 3.861 592 6744 e-13 0.000 000 0012 e-13 reduced Planck constant 1.054571817e-34 0 0 J s true 1.054 571 817... e-34 (exact) reduced Planck constant in eV s 6.582119569e-16 0 0 eV s true 6.582 119 569... e-16 (exact) reduced Planck constant times c in MeV fm 197.3269804 0 0 MeV fm true 197.326 980 4... (exact) reduced muon Compton wavelength 1.867594306e-15 4.2e-23 2.2e-8 m false 1.867 594 306 e-15 0.000 000 042 e-15 reduced neutron Compton wavelength 2.100194152e-16 1.1e-25 5.2e-10 m false 2.100 194 1520 e-16 0.000 000 0011 e-16 reduced proton Compton wavelength 2.10308910051e-16 6.6e-26 3.1e-10 m false 2.103 089 100 51 e-16 0.000 000 000 66 e-16 reduced tau Compton wavelength 1.110538e-16 7.5e-21 0.000068 m false 1.110 538 e-16 0.000 075 e-16 second radiation constant 0.01438776877 0 0 m K true 1.438 776 877... e-2 (exact) shielded helion gyromag. ratio 203789460.78 0.18 8.8e-10 s^-1 T^-1 false 2.037 894 6078 e8 0.000 000 0018 e8 shielded helion gyromag. ratio in MHz/T 32.434100033 2.8e-8 8.6e-10 MHz T^-1 false 32.434 100 033 0.000 000 028 shielded helion mag. mom. -1.07455311035e-26 9.3e-36 8.7e-10 J T^-1 false -1.074 553 110 35 e-26 0.000 000 000 93 e-26 shielded helion mag. mom. to Bohr magneton ratio -0.00115867149457 9.4e-13 8.1e-10 false -1.158 671 494 57 e-3 0.000 000 000 94 e-3 shielded helion mag. mom. to nuclear magneton ratio -2.1274977624 1.7e-9 8e-10 false -2.127 497 7624 0.000 000 0017 shielded helion to proton mag. mom. ratio -0.76176657721 6.6e-10 8.7e-10 false -0.761 766 577 21 0.000 000 000 66 shielded helion to shielded proton mag. mom. ratio -0.7617861334 3.1e-9 4.1e-9 false -0.761 786 1334 0.000 000 0031 shielded proton gyromag. ratio 267515319.4 1.1 4.1e-9 s^-1 T^-1 false 2.675 153 194 e8 0.000 000 011 e8 shielded proton gyromag. ratio in MHz/T 42.57638543 1.7e-7 4e-9 MHz T^-1 false 42.576 385 43 0.000 000 17 shielded proton mag. mom. 1.410570583e-26 5.8e-35 4.1e-9 J T^-1 false 1.410 570 5830 e-26 0.000 000 0058 e-26 shielded proton mag. mom. to Bohr magneton ratio 0.0015209931551 6.2e-12 4.1e-9 false 1.520 993 1551 e-3 0.000 000 0062 e-3 shielded proton mag. mom. to nuclear magneton ratio 2.792775648 1.1e-8 3.9e-9 false 2.792 775 648 0.000 000 011 shielding difference of d and p in HD 1.9877e-8 1e-12 0.00005 false 1.987 70 e-8 0.000 10 e-8 shielding difference of t and p in HT 2.3945e-8 2e-12 0.000084 false 2.394 50 e-8 0.000 20 e-8 speed of light in vacuum 299792458 0 0 m s^-1 true 299 792 458 (exact) standard acceleration of gravity 9.80665 0 0 m s^-2 true 9.806 65 (exact) standard atmosphere 101325 0 0 Pa true 101 325 (exact) standard-state pressure 100000 0 0 Pa true 100 000 (exact) tau Compton wavelength 6.97771e-16 4.7e-20 0.000067 m false 6.977 71 e-16 0.000 47 e-16 tau energy equivalent 1776.86 0.12 0.000068 MeV false 1776.86 0.12 tau mass 3.16754e-27 2.1e-31 0.000066 kg false 3.167 54 e-27 0.000 21 e-27 tau mass energy equivalent 2.84684e-10 1.9e-14 0.000067 J false 2.846 84 e-10 0.000 19 e-10 tau mass in u 1.90754 0.00013 0.000068 u false 1.907 54 0.000 13 tau molar mass 0.00190754 1.3e-7 0.000068 kg mol^-1 false 1.907 54 e-3 0.000 13 e-3 tau-electron mass ratio 3477.23 0.23 0.000066 false 3477.23 0.23 tau-muon mass ratio 16.817 0.0011 0.000065 false 16.8170 0.0011 tau-neutron mass ratio 1.89115 0.00013 0.000069 false 1.891 15 0.000 13 tau-proton mass ratio 1.89376 0.00013 0.000069 false 1.893 76 0.000 13 triton g factor 5.95792493 1.2e-8 2e-9 false 5.957 924 930 0.000 000 012 triton mag. mom. 1.5046095178e-26 3e-35 2e-9 J T^-1 false 1.504 609 5178 e-26 0.000 000 0030 e-26 triton mag. mom. to Bohr magneton ratio 0.0016223936648 3.2e-12 2e-9 false 1.622 393 6648 e-3 0.000 000 0032 e-3 triton mag. mom. to nuclear magneton ratio 2.978962465 5.9e-9 2e-9 false 2.978 962 4650 0.000 000 0059 triton mass 5.0073567512e-27 1.6e-36 3.2e-10 kg false 5.007 356 7512 e-27 0.000 000 0016 e-27 triton mass energy equivalent 4.5003878119e-10 1.4e-19 3.1e-10 J false 4.500 387 8119 e-10 0.000 000 0014 e-10 triton mass energy equivalent in MeV 2808.92113668 8.8e-7 3.1e-10 MeV false 2808.921 136 68 0.000 000 88 triton mass in u 3.01550071597 1e-10 3.3e-11 u false 3.015 500 715 97 0.000 000 000 10 triton molar mass 0.00301550071913 9.4e-13 3.1e-10 kg mol^-1 false 3.015 500 719 13 e-3 0.000 000 000 94 e-3 triton relative atomic mass 3.01550071597 1e-10 3.3e-11 false 3.015 500 715 97 0.000 000 000 10 triton to proton mag. mom. ratio 1.0666399189 2.1e-9 2e-9 false 1.066 639 9189 0.000 000 0021 triton-electron mass ratio 5496.92153551 2.1e-7 3.8e-11 false 5496.921 535 51 0.000 000 21 triton-proton mass ratio 2.99371703403 1e-10 3.3e-11 false 2.993 717 034 03 0.000 000 000 10 unified atomic mass unit 1.66053906892e-27 5.2e-37 3.1e-10 kg false 1.660 539 068 92 e-27 0.000 000 000 52 e-27 vacuum electric permittivity 8.8541878188e-12 1.4e-21 1.6e-10 F m^-1 false 8.854 187 8188 e-12 0.000 000 0014 e-12 vacuum mag. permeability 0.00000125663706127 2e-16 1.6e-10 N A^-2 false 1.256 637 061 27 e-6 0.000 000 000 20 e-6 von Klitzing constant 25812.80745 0 0 ohm true 25 812.807 45... (exact) weak mixing angle 0.22305 0.00023 0.001 false 0.223 05 0.000 23