Generated from pre-2019-codata-2014-raw.txt by tools/codata/build_codata_docs.py --nist-ascii.
Source: NIST CODATA 2014 Fundamental Physical Constants, Complete Listing. Canonical URL: https://physics.nist.gov/cuu/Constants/ArchiveASCII/allascii_2014.txt
Evidence-chain rule: this file is the named/value/unit source. The generated binary files must be rebuilt from this table by tools/codata/build_codata_docs.py, not hand-edited.
| index | quantity | value | uncertainty | unit |
|---|---|---|---|---|
| 1 | {220} lattice spacing of silicon | 192.015 5714 e-12 | 0.000 0032 e-12 | m |
| 2 | alpha particle-electron mass ratio | 7294.299 541 36 | 0.000 000 24 | |
| 3 | alpha particle mass | 6.644 657 230 e-27 | 0.000 000 082 e-27 | kg |
| 4 | alpha particle mass energy equivalent | 5.971 920 097 e-10 | 0.000 000 073 e-10 | J |
| 5 | alpha particle mass energy equivalent in MeV | 3727.379 378 | 0.000 023 | MeV |
| 6 | alpha particle mass in u | 4.001 506 179 127 | 0.000 000 000 063 | u |
| 7 | alpha particle molar mass | 4.001 506 179 127 e-3 | 0.000 000 000 063 e-3 | kg mol^-1 |
| 8 | alpha particle-proton mass ratio | 3.972 599 689 07 | 0.000 000 000 36 | |
| 9 | Angstrom star | 1.000 014 95 e-10 | 0.000 000 90 e-10 | m |
| 10 | atomic mass constant | 1.660 539 040 e-27 | 0.000 000 020 e-27 | kg |
| 11 | atomic mass constant energy equivalent | 1.492 418 062 e-10 | 0.000 000 018 e-10 | J |
| 12 | atomic mass constant energy equivalent in MeV | 931.494 0954 | 0.000 0057 | MeV |
| 13 | atomic mass unit-electron volt relationship | 931.494 0954 e6 | 0.000 0057 e6 | eV |
| 14 | atomic mass unit-hartree relationship | 3.423 177 6902 e7 | 0.000 000 0016 e7 | E_h |
| 15 | atomic mass unit-hertz relationship | 2.252 342 7206 e23 | 0.000 000 0010 e23 | Hz |
| 16 | atomic mass unit-inverse meter relationship | 7.513 006 6166 e14 | 0.000 000 0034 e14 | m^-1 |
| 17 | atomic mass unit-joule relationship | 1.492 418 062 e-10 | 0.000 000 018 e-10 | J |
| 18 | atomic mass unit-kelvin relationship | 1.080 954 38 e13 | 0.000 000 62 e13 | K |
| 19 | atomic mass unit-kilogram relationship | 1.660 539 040 e-27 | 0.000 000 020 e-27 | kg |
| 20 | atomic unit of 1st hyperpolarizability | 3.206 361 329 e-53 | 0.000 000 020 e-53 | C^3 m^3 J^-2 |
| 21 | atomic unit of 2nd hyperpolarizability | 6.235 380 085 e-65 | 0.000 000 077 e-65 | C^4 m^4 J^-3 |
| 22 | atomic unit of action | 1.054 571 800 e-34 | 0.000 000 013 e-34 | J s |
| 23 | atomic unit of charge | 1.602 176 6208 e-19 | 0.000 000 0098 e-19 | C |
| 24 | atomic unit of charge density | 1.081 202 3770 e12 | 0.000 000 0067 e12 | C m^-3 |
| 25 | atomic unit of current | 6.623 618 183 e-3 | 0.000 000 041 e-3 | A |
| 26 | atomic unit of electric dipole mom. | 8.478 353 552 e-30 | 0.000 000 052 e-30 | C m |
| 27 | atomic unit of electric field | 5.142 206 707 e11 | 0.000 000 032 e11 | V m^-1 |
| 28 | atomic unit of electric field gradient | 9.717 362 356 e21 | 0.000 000 060 e21 | V m^-2 |
| 29 | atomic unit of electric polarizability | 1.648 777 2731 e-41 | 0.000 000 0011 e-41 | C^2 m^2 J^-1 |
| 30 | atomic unit of electric potential | 27.211 386 02 | 0.000 000 17 | V |
| 31 | atomic unit of electric quadrupole mom. | 4.486 551 484 e-40 | 0.000 000 028 e-40 | C m^2 |
| 32 | atomic unit of energy | 4.359 744 650 e-18 | 0.000 000 054 e-18 | J |
| 33 | atomic unit of force | 8.238 723 36 e-8 | 0.000 000 10 e-8 | N |
| 34 | atomic unit of length | 0.529 177 210 67 e-10 | 0.000 000 000 12 e-10 | m |
| 35 | atomic unit of mag. dipole mom. | 1.854 801 999 e-23 | 0.000 000 011 e-23 | J T^-1 |
| 36 | atomic unit of mag. flux density | 2.350 517 550 e5 | 0.000 000 014 e5 | T |
| 37 | atomic unit of magnetizability | 7.891 036 5886 e-29 | 0.000 000 0090 e-29 | J T^-2 |
| 38 | atomic unit of mass | 9.109 383 56 e-31 | 0.000 000 11 e-31 | kg |
| 39 | atomic unit of mom.um | 1.992 851 882 e-24 | 0.000 000 024 e-24 | kg m s^-1 |
| 40 | atomic unit of permittivity | 1.112 650 056... e-10 | (exact) | F m^-1 |
| 41 | atomic unit of time | 2.418 884 326 509 e-17 | 0.000 000 000 014 e-17 | s |
| 42 | atomic unit of velocity | 2.187 691 262 77 e6 | 0.000 000 000 50 e6 | m s^-1 |
| 43 | Avogadro constant | 6.022 140 857 e23 | 0.000 000 074 e23 | mol^-1 |
| 44 | Bohr magneton | 927.400 9994 e-26 | 0.000 0057 e-26 | J T^-1 |
| 45 | Bohr magneton in eV/T | 5.788 381 8012 e-5 | 0.000 000 0026 e-5 | eV T^-1 |
| 46 | Bohr magneton in Hz/T | 13.996 245 042 e9 | 0.000 000 086 e9 | Hz T^-1 |
| 47 | Bohr magneton in inverse meters per tesla | 46.686 448 14 | 0.000 000 29 | m^-1 T^-1 |
| 48 | Bohr magneton in K/T | 0.671 714 05 | 0.000 000 39 | K T^-1 |
| 49 | Bohr radius | 0.529 177 210 67 e-10 | 0.000 000 000 12 e-10 | m |
| 50 | Boltzmann constant | 1.380 648 52 e-23 | 0.000 000 79 e-23 | J K^-1 |
| 51 | Boltzmann constant in eV/K | 8.617 3303 e-5 | 0.000 0050 e-5 | eV K^-1 |
| 52 | Boltzmann constant in Hz/K | 2.083 6612 e10 | 0.000 0012 e10 | Hz K^-1 |
| 53 | Boltzmann constant in inverse meters per kelvin | 69.503 457 | 0.000 040 | m^-1 K^-1 |
| 54 | characteristic impedance of vacuum | 376.730 313 461... | (exact) | ohm |
| 55 | classical electron radius | 2.817 940 3227 e-15 | 0.000 000 0019 e-15 | m |
| 56 | Compton wavelength | 2.426 310 2367 e-12 | 0.000 000 0011 e-12 | m |
| 57 | Compton wavelength over 2 pi | 386.159 267 64 e-15 | 0.000 000 18 e-15 | m |
| 58 | conductance quantum | 7.748 091 7310 e-5 | 0.000 000 0018 e-5 | S |
| 59 | conventional value of Josephson constant | 483 597.9 e9 | (exact) | Hz V^-1 |
| 60 | conventional value of von Klitzing constant | 25 812.807 | (exact) | ohm |
| 61 | Cu x unit | 1.002 076 97 e-13 | 0.000 000 28 e-13 | m |
| 62 | deuteron-electron mag. mom. ratio | -4.664 345 535 e-4 | 0.000 000 026 e-4 | |
| 63 | deuteron-electron mass ratio | 3670.482 967 85 | 0.000 000 13 | |
| 64 | deuteron g factor | 0.857 438 2311 | 0.000 000 0048 | |
| 65 | deuteron mag. mom. | 0.433 073 5040 e-26 | 0.000 000 0036 e-26 | J T^-1 |
| 66 | deuteron mag. mom. to Bohr magneton ratio | 0.466 975 4554 e-3 | 0.000 000 0026 e-3 | |
| 67 | deuteron mag. mom. to nuclear magneton ratio | 0.857 438 2311 | 0.000 000 0048 | |
| 68 | deuteron mass | 3.343 583 719 e-27 | 0.000 000 041 e-27 | kg |
| 69 | deuteron mass energy equivalent | 3.005 063 183 e-10 | 0.000 000 037 e-10 | J |
| 70 | deuteron mass energy equivalent in MeV | 1875.612 928 | 0.000 012 | MeV |
| 71 | deuteron mass in u | 2.013 553 212 745 | 0.000 000 000 040 | u |
| 72 | deuteron molar mass | 2.013 553 212 745 e-3 | 0.000 000 000 040 e-3 | kg mol^-1 |
| 73 | deuteron-neutron mag. mom. ratio | -0.448 206 52 | 0.000 000 11 | |
| 74 | deuteron-proton mag. mom. ratio | 0.307 012 2077 | 0.000 000 0015 | |
| 75 | deuteron-proton mass ratio | 1.999 007 500 87 | 0.000 000 000 19 | |
| 76 | deuteron rms charge radius | 2.1413 e-15 | 0.0025 e-15 | m |
| 77 | electric constant | 8.854 187 817... e-12 | (exact) | F m^-1 |
| 78 | electron charge to mass quotient | -1.758 820 024 e11 | 0.000 000 011 e11 | C kg^-1 |
| 79 | electron-deuteron mag. mom. ratio | -2143.923 499 | 0.000 012 | |
| 80 | electron-deuteron mass ratio | 2.724 437 107 484 e-4 | 0.000 000 000 096 e-4 | |
| 81 | electron g factor | -2.002 319 304 361 82 | 0.000 000 000 000 52 | |
| 82 | electron gyromag. ratio | 1.760 859 644 e11 | 0.000 000 011 e11 | s^-1 T^-1 |
| 83 | electron gyromag. ratio over 2 pi | 28 024.951 64 | 0.000 17 | MHz T^-1 |
| 84 | electron-helion mass ratio | 1.819 543 074 854 e-4 | 0.000 000 000 088 e-4 | |
| 85 | electron mag. mom. | -928.476 4620 e-26 | 0.000 0057 e-26 | J T^-1 |
| 86 | electron mag. mom. anomaly | 1.159 652 180 91 e-3 | 0.000 000 000 26 e-3 | |
| 87 | electron mag. mom. to Bohr magneton ratio | -1.001 159 652 180 91 | 0.000 000 000 000 26 | |
| 88 | electron mag. mom. to nuclear magneton ratio | -1838.281 972 34 | 0.000 000 17 | |
| 89 | electron mass | 9.109 383 56 e-31 | 0.000 000 11 e-31 | kg |
| 90 | electron mass energy equivalent | 8.187 105 65 e-14 | 0.000 000 10 e-14 | J |
| 91 | electron mass energy equivalent in MeV | 0.510 998 9461 | 0.000 000 0031 | MeV |
| 92 | electron mass in u | 5.485 799 090 70 e-4 | 0.000 000 000 16 e-4 | u |
| 93 | electron molar mass | 5.485 799 090 70 e-7 | 0.000 000 000 16 e-7 | kg mol^-1 |
| 94 | electron-muon mag. mom. ratio | 206.766 9880 | 0.000 0046 | |
| 95 | electron-muon mass ratio | 4.836 331 70 e-3 | 0.000 000 11 e-3 | |
| 96 | electron-neutron mag. mom. ratio | 960.920 50 | 0.000 23 | |
| 97 | electron-neutron mass ratio | 5.438 673 4428 e-4 | 0.000 000 0027 e-4 | |
| 98 | electron-proton mag. mom. ratio | -658.210 6866 | 0.000 0020 | |
| 99 | electron-proton mass ratio | 5.446 170 213 52 e-4 | 0.000 000 000 52 e-4 | |
| 100 | electron-tau mass ratio | 2.875 92 e-4 | 0.000 26 e-4 | |
| 101 | electron to alpha particle mass ratio | 1.370 933 554 798 e-4 | 0.000 000 000 045 e-4 | |
| 102 | electron to shielded helion mag. mom. ratio | 864.058 257 | 0.000 010 | |
| 103 | electron to shielded proton mag. mom. ratio | -658.227 5971 | 0.000 0072 | |
| 104 | electron-triton mass ratio | 1.819 200 062 203 e-4 | 0.000 000 000 084 e-4 | |
| 105 | electron volt | 1.602 176 6208 e-19 | 0.000 000 0098 e-19 | J |
| 106 | electron volt-atomic mass unit relationship | 1.073 544 1105 e-9 | 0.000 000 0066 e-9 | u |
| 107 | electron volt-hartree relationship | 3.674 932 248 e-2 | 0.000 000 023 e-2 | E_h |
| 108 | electron volt-hertz relationship | 2.417 989 262 e14 | 0.000 000 015 e14 | Hz |
| 109 | electron volt-inverse meter relationship | 8.065 544 005 e5 | 0.000 000 050 e5 | m^-1 |
| 110 | electron volt-joule relationship | 1.602 176 6208 e-19 | 0.000 000 0098 e-19 | J |
| 111 | electron volt-kelvin relationship | 1.160 452 21 e4 | 0.000 000 67 e4 | K |
| 112 | electron volt-kilogram relationship | 1.782 661 907 e-36 | 0.000 000 011 e-36 | kg |
| 113 | elementary charge | 1.602 176 6208 e-19 | 0.000 000 0098 e-19 | C |
| 114 | elementary charge over h | 2.417 989 262 e14 | 0.000 000 015 e14 | A J^-1 |
| 115 | Faraday constant | 96 485.332 89 | 0.000 59 | C mol^-1 |
| 116 | Faraday constant for conventional electric current | 96 485.3251 | 0.0012 | C_90 mol^-1 |
| 117 | Fermi coupling constant | 1.166 3787 e-5 | 0.000 0006 e-5 | GeV^-2 |
| 118 | fine-structure constant | 7.297 352 5664 e-3 | 0.000 000 0017 e-3 | |
| 119 | first radiation constant | 3.741 771 790 e-16 | 0.000 000 046 e-16 | W m^2 |
| 120 | first radiation constant for spectral radiance | 1.191 042 953 e-16 | 0.000 000 015 e-16 | W m^2 sr^-1 |
| 121 | hartree-atomic mass unit relationship | 2.921 262 3197 e-8 | 0.000 000 0013 e-8 | u |
| 122 | hartree-electron volt relationship | 27.211 386 02 | 0.000 000 17 | eV |
| 123 | Hartree energy | 4.359 744 650 e-18 | 0.000 000 054 e-18 | J |
| 124 | Hartree energy in eV | 27.211 386 02 | 0.000 000 17 | eV |
| 125 | hartree-hertz relationship | 6.579 683 920 711 e15 | 0.000 000 000 039 e15 | Hz |
| 126 | hartree-inverse meter relationship | 2.194 746 313 702 e7 | 0.000 000 000 013 e7 | m^-1 |
| 127 | hartree-joule relationship | 4.359 744 650 e-18 | 0.000 000 054 e-18 | J |
| 128 | hartree-kelvin relationship | 3.157 7513 e5 | 0.000 0018 e5 | K |
| 129 | hartree-kilogram relationship | 4.850 870 129 e-35 | 0.000 000 060 e-35 | kg |
| 130 | helion-electron mass ratio | 5495.885 279 22 | 0.000 000 27 | |
| 131 | helion g factor | -4.255 250 616 | 0.000 000 050 | |
| 132 | helion mag. mom. | -1.074 617 522 e-26 | 0.000 000 014 e-26 | J T^-1 |
| 133 | helion mag. mom. to Bohr magneton ratio | -1.158 740 958 e-3 | 0.000 000 014 e-3 | |
| 134 | helion mag. mom. to nuclear magneton ratio | -2.127 625 308 | 0.000 000 025 | |
| 135 | helion mass | 5.006 412 700 e-27 | 0.000 000 062 e-27 | kg |
| 136 | helion mass energy equivalent | 4.499 539 341 e-10 | 0.000 000 055 e-10 | J |
| 137 | helion mass energy equivalent in MeV | 2808.391 586 | 0.000 017 | MeV |
| 138 | helion mass in u | 3.014 932 246 73 | 0.000 000 000 12 | u |
| 139 | helion molar mass | 3.014 932 246 73 e-3 | 0.000 000 000 12 e-3 | kg mol^-1 |
| 140 | helion-proton mass ratio | 2.993 152 670 46 | 0.000 000 000 29 | |
| 141 | hertz-atomic mass unit relationship | 4.439 821 6616 e-24 | 0.000 000 0020 e-24 | u |
| 142 | hertz-electron volt relationship | 4.135 667 662 e-15 | 0.000 000 025 e-15 | eV |
| 143 | hertz-hartree relationship | 1.519 829 846 0088 e-16 | 0.000 000 000 0090 e-16 | E_h |
| 144 | hertz-inverse meter relationship | 3.335 640 951... e-9 | (exact) | m^-1 |
| 145 | hertz-joule relationship | 6.626 070 040 e-34 | 0.000 000 081 e-34 | J |
| 146 | hertz-kelvin relationship | 4.799 2447 e-11 | 0.000 0028 e-11 | K |
| 147 | hertz-kilogram relationship | 7.372 497 201 e-51 | 0.000 000 091 e-51 | kg |
| 148 | inverse fine-structure constant | 137.035 999 139 | 0.000 000 031 | |
| 149 | inverse meter-atomic mass unit relationship | 1.331 025 049 00 e-15 | 0.000 000 000 61 e-15 | u |
| 150 | inverse meter-electron volt relationship | 1.239 841 9739 e-6 | 0.000 000 0076 e-6 | eV |
| 151 | inverse meter-hartree relationship | 4.556 335 252 767 e-8 | 0.000 000 000 027 e-8 | E_h |
| 152 | inverse meter-hertz relationship | 299 792 458 | (exact) | Hz |
| 153 | inverse meter-joule relationship | 1.986 445 824 e-25 | 0.000 000 024 e-25 | J |
| 154 | inverse meter-kelvin relationship | 1.438 777 36 e-2 | 0.000 000 83 e-2 | K |
| 155 | inverse meter-kilogram relationship | 2.210 219 057 e-42 | 0.000 000 027 e-42 | kg |
| 156 | inverse of conductance quantum | 12 906.403 7278 | 0.000 0029 | ohm |
| 157 | Josephson constant | 483 597.8525 e9 | 0.0030 e9 | Hz V^-1 |
| 158 | joule-atomic mass unit relationship | 6.700 535 363 e9 | 0.000 000 082 e9 | u |
| 159 | joule-electron volt relationship | 6.241 509 126 e18 | 0.000 000 038 e18 | eV |
| 160 | joule-hartree relationship | 2.293 712 317 e17 | 0.000 000 028 e17 | E_h |
| 161 | joule-hertz relationship | 1.509 190 205 e33 | 0.000 000 019 e33 | Hz |
| 162 | joule-inverse meter relationship | 5.034 116 651 e24 | 0.000 000 062 e24 | m^-1 |
| 163 | joule-kelvin relationship | 7.242 9731 e22 | 0.000 0042 e22 | K |
| 164 | joule-kilogram relationship | 1.112 650 056... e-17 | (exact) | kg |
| 165 | kelvin-atomic mass unit relationship | 9.251 0842 e-14 | 0.000 0053 e-14 | u |
| 166 | kelvin-electron volt relationship | 8.617 3303 e-5 | 0.000 0050 e-5 | eV |
| 167 | kelvin-hartree relationship | 3.166 8105 e-6 | 0.000 0018 e-6 | E_h |
| 168 | kelvin-hertz relationship | 2.083 6612 e10 | 0.000 0012 e10 | Hz |
| 169 | kelvin-inverse meter relationship | 69.503 457 | 0.000 040 | m^-1 |
| 170 | kelvin-joule relationship | 1.380 648 52 e-23 | 0.000 000 79 e-23 | J |
| 171 | kelvin-kilogram relationship | 1.536 178 65 e-40 | 0.000 000 88 e-40 | kg |
| 172 | kilogram-atomic mass unit relationship | 6.022 140 857 e26 | 0.000 000 074 e26 | u |
| 173 | kilogram-electron volt relationship | 5.609 588 650 e35 | 0.000 000 034 e35 | eV |
| 174 | kilogram-hartree relationship | 2.061 485 823 e34 | 0.000 000 025 e34 | E_h |
| 175 | kilogram-hertz relationship | 1.356 392 512 e50 | 0.000 000 017 e50 | Hz |
| 176 | kilogram-inverse meter relationship | 4.524 438 411 e41 | 0.000 000 056 e41 | m^-1 |
| 177 | kilogram-joule relationship | 8.987 551 787... e16 | (exact) | J |
| 178 | kilogram-kelvin relationship | 6.509 6595 e39 | 0.000 0037 e39 | K |
| 179 | lattice parameter of silicon | 543.102 0504 e-12 | 0.000 0089 e-12 | m |
| 180 | Loschmidt constant (273.15 K, 100 kPa) | 2.651 6467 e25 | 0.000 0015 e25 | m^-3 |
| 181 | Loschmidt constant (273.15 K, 101.325 kPa) | 2.686 7811 e25 | 0.000 0015 e25 | m^-3 |
| 182 | mag. constant | 12.566 370 614... e-7 | (exact) | N A^-2 |
| 183 | mag. flux quantum | 2.067 833 831 e-15 | 0.000 000 013 e-15 | Wb |
| 184 | molar gas constant | 8.314 4598 | 0.000 0048 | J mol^-1 K^-1 |
| 185 | molar mass constant | 1 e-3 | (exact) | kg mol^-1 |
| 186 | molar mass of carbon-12 | 12 e-3 | (exact) | kg mol^-1 |
| 187 | molar Planck constant | 3.990 312 7110 e-10 | 0.000 000 0018 e-10 | J s mol^-1 |
| 188 | molar Planck constant times c | 0.119 626 565 582 | 0.000 000 000 054 | J m mol^-1 |
| 189 | molar volume of ideal gas (273.15 K, 100 kPa) | 22.710 947 e-3 | 0.000 013 e-3 | m^3 mol^-1 |
| 190 | molar volume of ideal gas (273.15 K, 101.325 kPa) | 22.413 962 e-3 | 0.000 013 e-3 | m^3 mol^-1 |
| 191 | molar volume of silicon | 12.058 832 14 e-6 | 0.000 000 61 e-6 | m^3 mol^-1 |
| 192 | Mo x unit | 1.002 099 52 e-13 | 0.000 000 53 e-13 | m |
| 193 | muon Compton wavelength | 11.734 441 11 e-15 | 0.000 000 26 e-15 | m |
| 194 | muon Compton wavelength over 2 pi | 1.867 594 308 e-15 | 0.000 000 042 e-15 | m |
| 195 | muon-electron mass ratio | 206.768 2826 | 0.000 0046 | |
| 196 | muon g factor | -2.002 331 8418 | 0.000 000 0013 | |
| 197 | muon mag. mom. | -4.490 448 26 e-26 | 0.000 000 10 e-26 | J T^-1 |
| 198 | muon mag. mom. anomaly | 1.165 920 89 e-3 | 0.000 000 63 e-3 | |
| 199 | muon mag. mom. to Bohr magneton ratio | -4.841 970 48 e-3 | 0.000 000 11 e-3 | |
| 200 | muon mag. mom. to nuclear magneton ratio | -8.890 597 05 | 0.000 000 20 | |
| 201 | muon mass | 1.883 531 594 e-28 | 0.000 000 048 e-28 | kg |
| 202 | muon mass energy equivalent | 1.692 833 774 e-11 | 0.000 000 043 e-11 | J |
| 203 | muon mass energy equivalent in MeV | 105.658 3745 | 0.000 0024 | MeV |
| 204 | muon mass in u | 0.113 428 9257 | 0.000 000 0025 | u |
| 205 | muon molar mass | 0.113 428 9257 e-3 | 0.000 000 0025 e-3 | kg mol^-1 |
| 206 | muon-neutron mass ratio | 0.112 454 5167 | 0.000 000 0025 | |
| 207 | muon-proton mag. mom. ratio | -3.183 345 142 | 0.000 000 071 | |
| 208 | muon-proton mass ratio | 0.112 609 5262 | 0.000 000 0025 | |
| 209 | muon-tau mass ratio | 5.946 49 e-2 | 0.000 54 e-2 | |
| 210 | natural unit of action | 1.054 571 800 e-34 | 0.000 000 013 e-34 | J s |
| 211 | natural unit of action in eV s | 6.582 119 514 e-16 | 0.000 000 040 e-16 | eV s |
| 212 | natural unit of energy | 8.187 105 65 e-14 | 0.000 000 10 e-14 | J |
| 213 | natural unit of energy in MeV | 0.510 998 9461 | 0.000 000 0031 | MeV |
| 214 | natural unit of length | 386.159 267 64 e-15 | 0.000 000 18 e-15 | m |
| 215 | natural unit of mass | 9.109 383 56 e-31 | 0.000 000 11 e-31 | kg |
| 216 | natural unit of mom.um | 2.730 924 488 e-22 | 0.000 000 034 e-22 | kg m s^-1 |
| 217 | natural unit of mom.um in MeV/c | 0.510 998 9461 | 0.000 000 0031 | MeV/c |
| 218 | natural unit of time | 1.288 088 667 12 e-21 | 0.000 000 000 58 e-21 | s |
| 219 | natural unit of velocity | 299 792 458 | (exact) | m s^-1 |
| 220 | neutron Compton wavelength | 1.319 590 904 81 e-15 | 0.000 000 000 88 e-15 | m |
| 221 | neutron Compton wavelength over 2 pi | 0.210 019 415 36 e-15 | 0.000 000 000 14 e-15 | m |
| 222 | neutron-electron mag. mom. ratio | 1.040 668 82 e-3 | 0.000 000 25 e-3 | |
| 223 | neutron-electron mass ratio | 1838.683 661 58 | 0.000 000 90 | |
| 224 | neutron g factor | -3.826 085 45 | 0.000 000 90 | |
| 225 | neutron gyromag. ratio | 1.832 471 72 e8 | 0.000 000 43 e8 | s^-1 T^-1 |
| 226 | neutron gyromag. ratio over 2 pi | 29.164 6933 | 0.000 0069 | MHz T^-1 |
| 227 | neutron mag. mom. | -0.966 236 50 e-26 | 0.000 000 23 e-26 | J T^-1 |
| 228 | neutron mag. mom. to Bohr magneton ratio | -1.041 875 63 e-3 | 0.000 000 25 e-3 | |
| 229 | neutron mag. mom. to nuclear magneton ratio | -1.913 042 73 | 0.000 000 45 | |
| 230 | neutron mass | 1.674 927 471 e-27 | 0.000 000 021 e-27 | kg |
| 231 | neutron mass energy equivalent | 1.505 349 739 e-10 | 0.000 000 019 e-10 | J |
| 232 | neutron mass energy equivalent in MeV | 939.565 4133 | 0.000 0058 | MeV |
| 233 | neutron mass in u | 1.008 664 915 88 | 0.000 000 000 49 | u |
| 234 | neutron molar mass | 1.008 664 915 88 e-3 | 0.000 000 000 49 e-3 | kg mol^-1 |
| 235 | neutron-muon mass ratio | 8.892 484 08 | 0.000 000 20 | |
| 236 | neutron-proton mag. mom. ratio | -0.684 979 34 | 0.000 000 16 | |
| 237 | neutron-proton mass difference | 2.305 573 77 e-30 | 0.000 000 85 e-30 | |
| 238 | neutron-proton mass difference energy equivalent | 2.072 146 37 e-13 | 0.000 000 76 e-13 | |
| 239 | neutron-proton mass difference energy equivalent in MeV | 1.293 332 05 | 0.000 000 48 | |
| 240 | neutron-proton mass difference in u | 0.001 388 449 00 | 0.000 000 000 51 | |
| 241 | neutron-proton mass ratio | 1.001 378 418 98 | 0.000 000 000 51 | |
| 242 | neutron-tau mass ratio | 0.528 790 | 0.000 048 | |
| 243 | neutron to shielded proton mag. mom. ratio | -0.684 996 94 | 0.000 000 16 | |
| 244 | Newtonian constant of gravitation | 6.674 08 e-11 | 0.000 31 e-11 | m^3 kg^-1 s^-2 |
| 245 | Newtonian constant of gravitation over h-bar c | 6.708 61 e-39 | 0.000 31 e-39 | (GeV/c^2)^-2 |
| 246 | nuclear magneton | 5.050 783 699 e-27 | 0.000 000 031 e-27 | J T^-1 |
| 247 | nuclear magneton in eV/T | 3.152 451 2550 e-8 | 0.000 000 0015 e-8 | eV T^-1 |
| 248 | nuclear magneton in inverse meters per tesla | 2.542 623 432 e-2 | 0.000 000 016 e-2 | m^-1 T^-1 |
| 249 | nuclear magneton in K/T | 3.658 2690 e-4 | 0.000 0021 e-4 | K T^-1 |
| 250 | nuclear magneton in MHz/T | 7.622 593 285 | 0.000 000 047 | MHz T^-1 |
| 251 | Planck constant | 6.626 070 040 e-34 | 0.000 000 081 e-34 | J s |
| 252 | Planck constant in eV s | 4.135 667 662 e-15 | 0.000 000 025 e-15 | eV s |
| 253 | Planck constant over 2 pi | 1.054 571 800 e-34 | 0.000 000 013 e-34 | J s |
| 254 | Planck constant over 2 pi in eV s | 6.582 119 514 e-16 | 0.000 000 040 e-16 | eV s |
| 255 | Planck constant over 2 pi times c in MeV fm | 197.326 9788 | 0.000 0012 | MeV fm |
| 256 | Planck length | 1.616 229 e-35 | 0.000 038 e-35 | m |
| 257 | Planck mass | 2.176 470 e-8 | 0.000 051 e-8 | kg |
| 258 | Planck mass energy equivalent in GeV | 1.220 910 e19 | 0.000 029 e19 | GeV |
| 259 | Planck temperature | 1.416 808 e32 | 0.000 033 e32 | K |
| 260 | Planck time | 5.391 16 e-44 | 0.000 13 e-44 | s |
| 261 | proton charge to mass quotient | 9.578 833 226 e7 | 0.000 000 059 e7 | C kg^-1 |
| 262 | proton Compton wavelength | 1.321 409 853 96 e-15 | 0.000 000 000 61 e-15 | m |
| 263 | proton Compton wavelength over 2 pi | 0.210 308 910 109 e-15 | 0.000 000 000 097 e-15 | m |
| 264 | proton-electron mass ratio | 1836.152 673 89 | 0.000 000 17 | |
| 265 | proton g factor | 5.585 694 702 | 0.000 000 017 | |
| 266 | proton gyromag. ratio | 2.675 221 900 e8 | 0.000 000 018 e8 | s^-1 T^-1 |
| 267 | proton gyromag. ratio over 2 pi | 42.577 478 92 | 0.000 000 29 | MHz T^-1 |
| 268 | proton mag. mom. | 1.410 606 7873 e-26 | 0.000 000 0097 e-26 | J T^-1 |
| 269 | proton mag. mom. to Bohr magneton ratio | 1.521 032 2053 e-3 | 0.000 000 0046 e-3 | |
| 270 | proton mag. mom. to nuclear magneton ratio | 2.792 847 3508 | 0.000 000 0085 | |
| 271 | proton mag. shielding correction | 25.691 e-6 | 0.011 e-6 | |
| 272 | proton mass | 1.672 621 898 e-27 | 0.000 000 021 e-27 | kg |
| 273 | proton massNEW | 1.672 621 92 e-27 | 0.000 000 021 e-27 | kg |
| 274 | proton mass energy equivalent | 1.503 277 593 e-10 | 0.000 000 018 e-10 | J |
| 275 | proton mass energy equivalent in MeV | 938.272 0813 | 0.000 0058 | MeV |
| 276 | proton mass in u | 1.007 276 466 879 | 0.000 000 000 091 | u |
| 277 | proton molar mass | 1.007 276 466 879 e-3 | 0.000 000 000 091 e-3 | kg mol^-1 |
| 278 | proton-muon mass ratio | 8.880 243 38 | 0.000 000 20 | |
| 279 | proton-neutron mag. mom. ratio | -1.459 898 05 | 0.000 000 34 | |
| 280 | proton-neutron mass ratio | 0.998 623 478 44 | 0.000 000 000 51 | |
| 281 | proton rms charge radius | 0.8751 e-15 | 0.0061 e-15 | m |
| 282 | proton-tau mass ratio | 0.528 063 | 0.000 048 | |
| 283 | quantum of circulation | 3.636 947 5486 e-4 | 0.000 000 0017 e-4 | m^2 s^-1 |
| 284 | quantum of circulation times 2 | 7.273 895 0972 e-4 | 0.000 000 0033 e-4 | m^2 s^-1 |
| 285 | Rydberg constant | 10 973 731.568 508 | 0.000 065 | m^-1 |
| 286 | Rydberg constant times c in Hz | 3.289 841 960 355 e15 | 0.000 000 000 019 e15 | Hz |
| 287 | Rydberg constant times hc in eV | 13.605 693 009 | 0.000 000 084 | eV |
| 288 | Rydberg constant times hc in J | 2.179 872 325 e-18 | 0.000 000 027 e-18 | J |
| 289 | Sackur-Tetrode constant (1 K, 100 kPa) | -1.151 7084 | 0.000 0014 | |
| 290 | Sackur-Tetrode constant (1 K, 101.325 kPa) | -1.164 8714 | 0.000 0014 | |
| 291 | second radiation constant | 1.438 777 36 e-2 | 0.000 000 83 e-2 | m K |
| 292 | shielded helion gyromag. ratio | 2.037 894 585 e8 | 0.000 000 027 e8 | s^-1 T^-1 |
| 293 | shielded helion gyromag. ratio over 2 pi | 32.434 099 66 | 0.000 000 43 | MHz T^-1 |
| 294 | shielded helion mag. mom. | -1.074 553 080 e-26 | 0.000 000 014 e-26 | J T^-1 |
| 295 | shielded helion mag. mom. to Bohr magneton ratio | -1.158 671 471 e-3 | 0.000 000 014 e-3 | |
| 296 | shielded helion mag. mom. to nuclear magneton ratio | -2.127 497 720 | 0.000 000 025 | |
| 297 | shielded helion to proton mag. mom. ratio | -0.761 766 5603 | 0.000 000 0092 | |
| 298 | shielded helion to shielded proton mag. mom. ratio | -0.761 786 1313 | 0.000 000 0033 | |
| 299 | shielded proton gyromag. ratio | 2.675 153 171 e8 | 0.000 000 033 e8 | s^-1 T^-1 |
| 300 | shielded proton gyromag. ratio over 2 pi | 42.576 385 07 | 0.000 000 53 | MHz T^-1 |
| 301 | shielded proton mag. mom. | 1.410 570 547 e-26 | 0.000 000 018 e-26 | J T^-1 |
| 302 | shielded proton mag. mom. to Bohr magneton ratio | 1.520 993 128 e-3 | 0.000 000 017 e-3 | |
| 303 | shielded proton mag. mom. to nuclear magneton ratio | 2.792 775 600 | 0.000 000 030 | |
| 304 | speed of light in vacuum | 299 792 458 | (exact) | m s^-1 |
| 305 | standard acceleration of gravity | 9.806 65 | (exact) | m s^-2 |
| 306 | standard atmosphere | 101 325 | (exact) | Pa |
| 307 | standard-state pressure | 100 000 | (exact) | Pa |
| 308 | Stefan-Boltzmann constant | 5.670 367 e-8 | 0.000 013 e-8 | W m^-2 K^-4 |
| 309 | tau Compton wavelength | 0.697 787 e-15 | 0.000 063 e-15 | m |
| 310 | tau Compton wavelength over 2 pi | 0.111 056 e-15 | 0.000 010 e-15 | m |
| 311 | tau-electron mass ratio | 3477.15 | 0.31 | |
| 312 | tau mass | 3.167 47 e-27 | 0.000 29 e-27 | kg |
| 313 | tau mass energy equivalent | 2.846 78 e-10 | 0.000 26 e-10 | J |
| 314 | tau mass energy equivalent in MeV | 1776.82 | 0.16 | MeV |
| 315 | tau mass in u | 1.907 49 | 0.000 17 | u |
| 316 | tau molar mass | 1.907 49 e-3 | 0.000 17 e-3 | kg mol^-1 |
| 317 | tau-muon mass ratio | 16.8167 | 0.0015 | |
| 318 | tau-neutron mass ratio | 1.891 11 | 0.000 17 | |
| 319 | tau-proton mass ratio | 1.893 72 | 0.000 17 | |
| 320 | Thomson cross section | 0.665 245 871 58 e-28 | 0.000 000 000 91 e-28 | m^2 |
| 321 | triton-electron mass ratio | 5496.921 535 88 | 0.000 000 26 | |
| 322 | triton g factor | 5.957 924 920 | 0.000 000 028 | |
| 323 | triton mag. mom. | 1.504 609 503 e-26 | 0.000 000 012 e-26 | J T^-1 |
| 324 | triton mag. mom. to Bohr magneton ratio | 1.622 393 6616 e-3 | 0.000 000 0076 e-3 | |
| 325 | triton mag. mom. to nuclear magneton ratio | 2.978 962 460 | 0.000 000 014 | |
| 326 | triton mass | 5.007 356 665 e-27 | 0.000 000 062 e-27 | kg |
| 327 | triton mass energy equivalent | 4.500 387 735 e-10 | 0.000 000 055 e-10 | J |
| 328 | triton mass energy equivalent in MeV | 2808.921 112 | 0.000 017 | MeV |
| 329 | triton mass in u | 3.015 500 716 32 | 0.000 000 000 11 | u |
| 330 | triton molar mass | 3.015 500 716 32 e-3 | 0.000 000 000 11 e-3 | kg mol^-1 |
| 331 | triton-proton mass ratio | 2.993 717 033 48 | 0.000 000 000 22 | |
| 332 | unified atomic mass unit | 1.660 539 040 e-27 | 0.000 000 020 e-27 | kg |
| 333 | von Klitzing constant | 25 812.807 4555 | 0.000 0059 | ohm |
| 334 | weak mixing angle | 0.2223 | 0.0021 | |
| 335 | Wien frequency displacement law constant | 5.878 9238 e10 | 0.000 0034 e10 | Hz K^-1 |
| 336 | Wien wavelength displacement law constant | 2.897 7729 e-3 | 0.000 0017 e-3 | m K |