
             Fundamental Physical Constants --- Complete Listing


  From:  http://physics.nist.gov/constants



  Quantity                                                       Value                 Uncertainty           Unit
-----------------------------------------------------------------------------------------------------------------------------
{220} lattice spacing of silicon                            192.015 5714 e-12        0.000 0032 e-12          m
alpha particle-electron mass ratio                          7294.299 5361            0.000 0029
alpha particle mass                                         6.644 656 75 e-27        0.000 000 29 e-27        kg
alpha particle mass energy equivalent                       5.971 919 67 e-10        0.000 000 26 e-10        J
alpha particle mass energy equivalent in MeV                3727.379 240             0.000 082                MeV
alpha particle mass in u                                    4.001 506 179 125        0.000 000 000 062        u
alpha particle molar mass                                   4.001 506 179 125 e-3    0.000 000 000 062 e-3    kg mol^-1
alpha particle-proton mass ratio                            3.972 599 689 33         0.000 000 000 36
Angstrom star                                               1.000 014 95 e-10        0.000 000 90 e-10        m
atomic mass constant                                        1.660 538 921 e-27       0.000 000 073 e-27       kg
atomic mass constant energy equivalent                      1.492 417 954 e-10       0.000 000 066 e-10       J
atomic mass constant energy equivalent in MeV               931.494 061              0.000 021                MeV
atomic mass unit-electron volt relationship                 931.494 061 e6           0.000 021 e6             eV
atomic mass unit-hartree relationship                       3.423 177 6845 e7        0.000 000 0024 e7        E_h
atomic mass unit-hertz relationship                         2.252 342 7168 e23       0.000 000 0016 e23       Hz
atomic mass unit-inverse meter relationship                 7.513 006 6042 e14       0.000 000 0053 e14       m^-1
atomic mass unit-joule relationship                         1.492 417 954 e-10       0.000 000 066 e-10       J
atomic mass unit-kelvin relationship                        1.080 954 08 e13         0.000 000 98 e13         K
atomic mass unit-kilogram relationship                      1.660 538 921 e-27       0.000 000 073 e-27       kg
atomic unit of 1st hyperpolarizability                      3.206 361 449 e-53       0.000 000 071 e-53       C^3 m^3 J^-2
atomic unit of 2nd hyperpolarizability                      6.235 380 54 e-65        0.000 000 28 e-65        C^4 m^4 J^-3
atomic unit of action                                       1.054 571 726 e-34       0.000 000 047 e-34       J s
atomic unit of charge                                       1.602 176 565 e-19       0.000 000 035 e-19       C
atomic unit of charge density                               1.081 202 338 e12        0.000 000 024 e12        C m^-3
atomic unit of current                                      6.623 617 95 e-3         0.000 000 15 e-3         A
atomic unit of electric dipole mom.                         8.478 353 26 e-30        0.000 000 19 e-30        C m
atomic unit of electric field                               5.142 206 52 e11         0.000 000 11 e11         V m^-1
atomic unit of electric field gradient                      9.717 362 00 e21         0.000 000 21 e21         V m^-2
atomic unit of electric polarizability                      1.648 777 2754 e-41      0.000 000 0016 e-41      C^2 m^2 J^-1
atomic unit of electric potential                           27.211 385 05            0.000 000 60             V
atomic unit of electric quadrupole mom.                     4.486 551 331 e-40       0.000 000 099 e-40       C m^2
atomic unit of energy                                       4.359 744 34 e-18        0.000 000 19 e-18        J
atomic unit of force                                        8.238 722 78 e-8         0.000 000 36 e-8         N
atomic unit of length                                       0.529 177 210 92 e-10    0.000 000 000 17 e-10    m
atomic unit of mag. dipole mom.                             1.854 801 936 e-23       0.000 000 041 e-23       J T^-1
atomic unit of mag. flux density                            2.350 517 464 e5         0.000 000 052 e5         T
atomic unit of magnetizability                              7.891 036 607 e-29       0.000 000 013 e-29       J T^-2
atomic unit of mass                                         9.109 382 91 e-31        0.000 000 40 e-31        kg
atomic unit of mom.um                                       1.992 851 740 e-24       0.000 000 088 e-24       kg m s^-1
atomic unit of permittivity                                 1.112 650 056... e-10    (exact)                  F m^-1
atomic unit of time                                         2.418 884 326 502 e-17   0.000 000 000 012 e-17   s
atomic unit of velocity                                     2.187 691 263 79 e6      0.000 000 000 71 e6      m s^-1
Avogadro constant                                           6.022 141 29 e23         0.000 000 27 e23         mol^-1
Bohr magneton                                               927.400 968 e-26         0.000 020 e-26           J T^-1
Bohr magneton in eV/T                                       5.788 381 8066 e-5       0.000 000 0038 e-5       eV T^-1
Bohr magneton in Hz/T                                       13.996 245 55 e9         0.000 000 31 e9          Hz T^-1
Bohr magneton in inverse meters per tesla                   46.686 4498              0.000 0010               m^-1 T^-1
Bohr magneton in K/T                                        0.671 713 88             0.000 000 61             K T^-1
Bohr radius                                                 0.529 177 210 92 e-10    0.000 000 000 17 e-10    m
Boltzmann constant                                          1.380 6488 e-23          0.000 0013 e-23          J K^-1
Boltzmann constant in eV/K                                  8.617 3324 e-5           0.000 0078 e-5           eV K^-1
Boltzmann constant in Hz/K                                  2.083 6618 e10           0.000 0019 e10           Hz K^-1
Boltzmann constant in inverse meters per kelvin             69.503 476               0.000 063                m^-1 K^-1
characteristic impedance of vacuum                          376.730 313 461...       (exact)                  ohm
classical electron radius                                   2.817 940 3267 e-15      0.000 000 0027 e-15      m
Compton wavelength                                          2.426 310 2389 e-12      0.000 000 0016 e-12      m
Compton wavelength over 2 pi                                386.159 268 00 e-15      0.000 000 25 e-15        m
conductance quantum                                         7.748 091 7346 e-5       0.000 000 0025 e-5       S
conventional value of Josephson constant                    483 597.9 e9             (exact)                  Hz V^-1
conventional value of von Klitzing constant                 25 812.807               (exact)                  ohm
Cu x unit                                                   1.002 076 97 e-13        0.000 000 28 e-13        m
deuteron-electron mag. mom. ratio                           -4.664 345 537 e-4       0.000 000 039 e-4
deuteron-electron mass ratio                                3670.482 9652            0.000 0015
deuteron g factor                                           0.857 438 2308           0.000 000 0072
deuteron mag. mom.                                          0.433 073 489 e-26       0.000 000 010 e-26       J T^-1
deuteron mag. mom. to Bohr magneton ratio                   0.466 975 4556 e-3       0.000 000 0039 e-3
deuteron mag. mom. to nuclear magneton ratio                0.857 438 2308           0.000 000 0072
deuteron mass                                               3.343 583 48 e-27        0.000 000 15 e-27        kg
deuteron mass energy equivalent                             3.005 062 97 e-10        0.000 000 13 e-10        J
deuteron mass energy equivalent in MeV                      1875.612 859             0.000 041                MeV
deuteron mass in u                                          2.013 553 212 712        0.000 000 000 077        u
deuteron molar mass                                         2.013 553 212 712 e-3    0.000 000 000 077 e-3    kg mol^-1
deuteron-neutron mag. mom. ratio                            -0.448 206 52            0.000 000 11
deuteron-proton mag. mom. ratio                             0.307 012 2070           0.000 000 0024
deuteron-proton mass ratio                                  1.999 007 500 97         0.000 000 000 18
deuteron rms charge radius                                  2.1424 e-15              0.0021 e-15              m
electric constant                                           8.854 187 817... e-12    (exact)                  F m^-1
electron charge to mass quotient                            -1.758 820 088 e11       0.000 000 039 e11        C kg^-1
electron-deuteron mag. mom. ratio                           -2143.923 498            0.000 018
electron-deuteron mass ratio                                2.724 437 1095 e-4       0.000 000 0011 e-4
electron g factor                                           -2.002 319 304 361 53    0.000 000 000 000 53
electron gyromag. ratio                                     1.760 859 708 e11        0.000 000 039 e11        s^-1 T^-1
electron gyromag. ratio over 2 pi                           28 024.952 66            0.000 62                 MHz T^-1
electron-helion mass ratio                                  1.819 543 0761 e-4       0.000 000 0017 e-4
electron mag. mom.                                          -928.476 430 e-26        0.000 021 e-26           J T^-1
electron mag. mom. anomaly                                  1.159 652 180 76 e-3     0.000 000 000 27 e-3
electron mag. mom. to Bohr magneton ratio                   -1.001 159 652 180 76    0.000 000 000 000 27
electron mag. mom. to nuclear magneton ratio                -1838.281 970 90         0.000 000 75
electron mass                                               9.109 382 91 e-31        0.000 000 40 e-31        kg
electron mass energy equivalent                             8.187 105 06 e-14        0.000 000 36 e-14        J
electron mass energy equivalent in MeV                      0.510 998 928            0.000 000 011            MeV
electron mass in u                                          5.485 799 0946 e-4       0.000 000 0022 e-4       u
electron molar mass                                         5.485 799 0946 e-7       0.000 000 0022 e-7       kg mol^-1
electron-muon mag. mom. ratio                               206.766 9896             0.000 0052
electron-muon mass ratio                                    4.836 331 66 e-3         0.000 000 12 e-3
electron-neutron mag. mom. ratio                            960.920 50               0.000 23
electron-neutron mass ratio                                 5.438 673 4461 e-4       0.000 000 0032 e-4
electron-proton mag. mom. ratio                             -658.210 6848            0.000 0054
electron-proton mass ratio                                  5.446 170 2178 e-4       0.000 000 0022 e-4
electron-tau mass ratio                                     2.875 92 e-4             0.000 26 e-4
electron to alpha particle mass ratio                       1.370 933 555 78 e-4     0.000 000 000 55 e-4
electron to shielded helion mag. mom. ratio                 864.058 257              0.000 010
electron to shielded proton mag. mom. ratio                 -658.227 5971            0.000 0072
electron-triton mass ratio                                  1.819 200 0653 e-4       0.000 000 0017 e-4
electron volt                                               1.602 176 565 e-19       0.000 000 035 e-19       J
electron volt-atomic mass unit relationship                 1.073 544 150 e-9        0.000 000 024 e-9        u
electron volt-hartree relationship                          3.674 932 379 e-2        0.000 000 081 e-2        E_h
electron volt-hertz relationship                            2.417 989 348 e14        0.000 000 053 e14        Hz
electron volt-inverse meter relationship                    8.065 544 29 e5          0.000 000 18 e5          m^-1
electron volt-joule relationship                            1.602 176 565 e-19       0.000 000 035 e-19       J
electron volt-kelvin relationship                           1.160 4519 e4            0.000 0011 e4            K
electron volt-kilogram relationship                         1.782 661 845 e-36       0.000 000 039 e-36       kg
elementary charge                                           1.602 176 565 e-19       0.000 000 035 e-19       C
elementary charge over h                                    2.417 989 348 e14        0.000 000 053 e14        A J^-1
Faraday constant                                            96 485.3365              0.0021                   C mol^-1
Faraday constant for conventional electric current          96 485.3321              0.0043                   C_90 mol^-1
Fermi coupling constant                                     1.166 364 e-5            0.000 005 e-5            GeV^-2
fine-structure constant                                     7.297 352 5698 e-3       0.000 000 0024 e-3
first radiation constant                                    3.741 771 53 e-16        0.000 000 17 e-16        W m^2
first radiation constant for spectral radiance              1.191 042 869 e-16       0.000 000 053 e-16       W m^2 sr^-1
hartree-atomic mass unit relationship                       2.921 262 3246 e-8       0.000 000 0021 e-8       u
hartree-electron volt relationship                          27.211 385 05            0.000 000 60             eV
Hartree energy                                              4.359 744 34 e-18        0.000 000 19 e-18        J
Hartree energy in eV                                        27.211 385 05            0.000 000 60             eV
hartree-hertz relationship                                  6.579 683 920 729 e15    0.000 000 000 033 e15    Hz
hartree-inverse meter relationship                          2.194 746 313 708 e7     0.000 000 000 011 e7     m^-1
hartree-joule relationship                                  4.359 744 34 e-18        0.000 000 19 e-18        J
hartree-kelvin relationship                                 3.157 7504 e5            0.000 0029 e5            K
hartree-kilogram relationship                               4.850 869 79 e-35        0.000 000 21 e-35        kg
helion-electron mass ratio                                  5495.885 2754            0.000 0050
helion g factor                                             -4.255 250 613           0.000 000 050
helion mag. mom.                                            -1.074 617 486 e-26      0.000 000 027 e-26       J T^-1
helion mag. mom. to Bohr magneton ratio                     -1.158 740 958 e-3       0.000 000 014 e-3
helion mag. mom. to nuclear magneton ratio                  -2.127 625 306           0.000 000 025
helion mass                                                 5.006 412 34 e-27        0.000 000 22 e-27        kg
helion mass energy equivalent                               4.499 539 02 e-10        0.000 000 20 e-10        J
helion mass energy equivalent in MeV                        2808.391 482             0.000 062                MeV
helion mass in u                                            3.014 932 2468           0.000 000 0025           u
helion molar mass                                           3.014 932 2468 e-3       0.000 000 0025 e-3       kg mol^-1
helion-proton mass ratio                                    2.993 152 6707           0.000 000 0025
hertz-atomic mass unit relationship                         4.439 821 6689 e-24      0.000 000 0031 e-24      u
hertz-electron volt relationship                            4.135 667 516 e-15       0.000 000 091 e-15       eV
hertz-hartree relationship                                  1.519 829 846 0045 e-16  0.000 000 000 0076 e-16  E_h
hertz-inverse meter relationship                            3.335 640 951... e-9     (exact)                  m^-1
hertz-joule relationship                                    6.626 069 57 e-34        0.000 000 29 e-34        J
hertz-kelvin relationship                                   4.799 2434 e-11          0.000 0044 e-11          K
hertz-kilogram relationship                                 7.372 496 68 e-51        0.000 000 33 e-51        kg
inverse fine-structure constant                             137.035 999 074          0.000 000 044
inverse meter-atomic mass unit relationship                 1.331 025 051 20 e-15    0.000 000 000 94 e-15    u
inverse meter-electron volt relationship                    1.239 841 930 e-6        0.000 000 027 e-6        eV
inverse meter-hartree relationship                          4.556 335 252 755 e-8    0.000 000 000 023 e-8    E_h
inverse meter-hertz relationship                            299 792 458              (exact)                  Hz
inverse meter-joule relationship                            1.986 445 684 e-25       0.000 000 088 e-25       J
inverse meter-kelvin relationship                           1.438 7770 e-2           0.000 0013 e-2           K
inverse meter-kilogram relationship                         2.210 218 902 e-42       0.000 000 098 e-42       kg
inverse of conductance quantum                              12 906.403 7217          0.000 0042               ohm
Josephson constant                                          483 597.870 e9           0.011 e9                 Hz V^-1
joule-atomic mass unit relationship                         6.700 535 85 e9          0.000 000 30 e9          u
joule-electron volt relationship                            6.241 509 34 e18         0.000 000 14 e18         eV
joule-hartree relationship                                  2.293 712 48 e17         0.000 000 10 e17         E_h
joule-hertz relationship                                    1.509 190 311 e33        0.000 000 067 e33        Hz
joule-inverse meter relationship                            5.034 117 01 e24         0.000 000 22 e24         m^-1
joule-kelvin relationship                                   7.242 9716 e22           0.000 0066 e22           K
joule-kilogram relationship                                 1.112 650 056... e-17    (exact)                  kg
kelvin-atomic mass unit relationship                        9.251 0868 e-14          0.000 0084 e-14          u
kelvin-electron volt relationship                           8.617 3324 e-5           0.000 0078 e-5           eV
kelvin-hartree relationship                                 3.166 8114 e-6           0.000 0029 e-6           E_h
kelvin-hertz relationship                                   2.083 6618 e10           0.000 0019 e10           Hz
kelvin-inverse meter relationship                           69.503 476               0.000 063                m^-1
kelvin-joule relationship                                   1.380 6488 e-23          0.000 0013 e-23          J
kelvin-kilogram relationship                                1.536 1790 e-40          0.000 0014 e-40          kg
kilogram-atomic mass unit relationship                      6.022 141 29 e26         0.000 000 27 e26         u
kilogram-electron volt relationship                         5.609 588 85 e35         0.000 000 12 e35         eV
kilogram-hartree relationship                               2.061 485 968 e34        0.000 000 091 e34        E_h
kilogram-hertz relationship                                 1.356 392 608 e50        0.000 000 060 e50        Hz
kilogram-inverse meter relationship                         4.524 438 73 e41         0.000 000 20 e41         m^-1
kilogram-joule relationship                                 8.987 551 787... e16     (exact)                  J
kilogram-kelvin relationship                                6.509 6582 e39           0.000 0059 e39           K
lattice parameter of silicon                                543.102 0504 e-12        0.000 0089 e-12          m
Loschmidt constant (273.15 K, 100 kPa)                      2.651 6462 e25           0.000 0024 e25           m^-3
Loschmidt constant (273.15 K, 101.325 kPa)                  2.686 7805 e25           0.000 0024 e25           m^-3
mag. constant                                               12.566 370 614... e-7    (exact)                  N A^-2
mag. flux quantum                                           2.067 833 758 e-15       0.000 000 046 e-15       Wb
molar gas constant                                          8.314 4621               0.000 0075               J mol^-1 K^-1
molar mass constant                                         1 e-3                    (exact)                  kg mol^-1
molar mass of carbon-12                                     12 e-3                   (exact)                  kg mol^-1
molar Planck constant                                       3.990 312 7176 e-10      0.000 000 0028 e-10      J s mol^-1
molar Planck constant times c                               0.119 626 565 779        0.000 000 000 084        J m mol^-1
molar volume of ideal gas (273.15 K, 100 kPa)               22.710 953 e-3           0.000 021 e-3            m^3 mol^-1
molar volume of ideal gas (273.15 K, 101.325 kPa)           22.413 968 e-3           0.000 020 e-3            m^3 mol^-1
molar volume of silicon                                     12.058 833 01 e-6        0.000 000 80 e-6         m^3 mol^-1
Mo x unit                                                   1.002 099 52 e-13        0.000 000 53 e-13        m
muon Compton wavelength                                     11.734 441 03 e-15       0.000 000 30 e-15        m
muon Compton wavelength over 2 pi                           1.867 594 294 e-15       0.000 000 047 e-15       m
muon-electron mass ratio                                    206.768 2843             0.000 0052
muon g factor                                               -2.002 331 8418          0.000 000 0013
muon mag. mom.                                              -4.490 448 07 e-26       0.000 000 15 e-26        J T^-1
muon mag. mom. anomaly                                      1.165 920 91 e-3         0.000 000 63 e-3
muon mag. mom. to Bohr magneton ratio                       -4.841 970 44 e-3        0.000 000 12 e-3
muon mag. mom. to nuclear magneton ratio                    -8.890 596 97            0.000 000 22
muon mass                                                   1.883 531 475 e-28       0.000 000 096 e-28       kg
muon mass energy equivalent                                 1.692 833 667 e-11       0.000 000 086 e-11       J
muon mass energy equivalent in MeV                          105.658 3715             0.000 0035               MeV
muon mass in u                                              0.113 428 9267           0.000 000 0029           u
muon molar mass                                             0.113 428 9267 e-3       0.000 000 0029 e-3       kg mol^-1
muon-neutron mass ratio                                     0.112 454 5177           0.000 000 0028
muon-proton mag. mom. ratio                                 -3.183 345 107           0.000 000 084
muon-proton mass ratio                                      0.112 609 5272           0.000 000 0028
muon-tau mass ratio                                         5.946 49 e-2             0.000 54 e-2
natural unit of action                                      1.054 571 726 e-34       0.000 000 047 e-34       J s
natural unit of action in eV s                              6.582 119 28 e-16        0.000 000 15 e-16        eV s
natural unit of energy                                      8.187 105 06 e-14        0.000 000 36 e-14        J
natural unit of energy in MeV                               0.510 998 928            0.000 000 011            MeV
natural unit of length                                      386.159 268 00 e-15      0.000 000 25 e-15        m
natural unit of mass                                        9.109 382 91 e-31        0.000 000 40 e-31        kg
natural unit of mom.um                                      2.730 924 29 e-22        0.000 000 12 e-22        kg m s^-1
natural unit of mom.um in MeV/c                             0.510 998 928            0.000 000 011            MeV/c
natural unit of time                                        1.288 088 668 33 e-21    0.000 000 000 83 e-21    s
natural unit of velocity                                    299 792 458              (exact)                  m s^-1
neutron Compton wavelength                                  1.319 590 9068 e-15      0.000 000 0011 e-15      m
neutron Compton wavelength over 2 pi                        0.210 019 415 68 e-15    0.000 000 000 17 e-15    m
neutron-electron mag. mom. ratio                            1.040 668 82 e-3         0.000 000 25 e-3
neutron-electron mass ratio                                 1838.683 6605            0.000 0011
neutron g factor                                            -3.826 085 45            0.000 000 90
neutron gyromag. ratio                                      1.832 471 79 e8          0.000 000 43 e8          s^-1 T^-1
neutron gyromag. ratio over 2 pi                            29.164 6943              0.000 0069               MHz T^-1
neutron mag. mom.                                           -0.966 236 47 e-26       0.000 000 23 e-26        J T^-1
neutron mag. mom. to Bohr magneton ratio                    -1.041 875 63 e-3        0.000 000 25 e-3
neutron mag. mom. to nuclear magneton ratio                 -1.913 042 72            0.000 000 45
neutron mass                                                1.674 927 351 e-27       0.000 000 074 e-27       kg
neutron mass energy equivalent                              1.505 349 631 e-10       0.000 000 066 e-10       J
neutron mass energy equivalent in MeV                       939.565 379              0.000 021                MeV
neutron mass in u                                           1.008 664 916 00         0.000 000 000 43         u
neutron molar mass                                          1.008 664 916 00 e-3     0.000 000 000 43 e-3     kg mol^-1
neutron-muon mass ratio                                     8.892 484 00             0.000 000 22
neutron-proton mag. mom. ratio                              -0.684 979 34            0.000 000 16
neutron-proton mass difference                              2.305 573 92 e-30        0.000 000 76 e-30
neutron-proton mass difference energy equivalent            2.072 146 50 e-13        0.000 000 68 e-13
neutron-proton mass difference energy equivalent in MeV     1.293 332 17             0.000 000 42
neutron-proton mass difference in u                         0.001 388 449 19         0.000 000 000 45
neutron-proton mass ratio                                   1.001 378 419 17         0.000 000 000 45
neutron-tau mass ratio                                      0.528 790                0.000 048
neutron to shielded proton mag. mom. ratio                  -0.684 996 94            0.000 000 16
Newtonian constant of gravitation                           6.673 84 e-11            0.000 80 e-11            m^3 kg^-1 s^-2
Newtonian constant of gravitation over h-bar c              6.708 37 e-39            0.000 80 e-39            (GeV/c^2)^-2
nuclear magneton                                            5.050 783 53 e-27        0.000 000 11 e-27        J T^-1
nuclear magneton in eV/T                                    3.152 451 2605 e-8       0.000 000 0022 e-8       eV T^-1
nuclear magneton in inverse meters per tesla                2.542 623 527 e-2        0.000 000 056 e-2        m^-1 T^-1
nuclear magneton in K/T                                     3.658 2682 e-4           0.000 0033 e-4           K T^-1
nuclear magneton in MHz/T                                   7.622 593 57             0.000 000 17             MHz T^-1
Planck constant                                             6.626 069 57 e-34        0.000 000 29 e-34        J s
Planck constant in eV s                                     4.135 667 516 e-15       0.000 000 091 e-15       eV s
Planck constant over 2 pi                                   1.054 571 726 e-34       0.000 000 047 e-34       J s
Planck constant over 2 pi in eV s                           6.582 119 28 e-16        0.000 000 15 e-16        eV s
Planck constant over 2 pi times c in MeV fm                 197.326 9718             0.000 0044               MeV fm
Planck length                                               1.616 199 e-35           0.000 097 e-35           m
Planck mass                                                 2.176 51 e-8             0.000 13 e-8             kg
Planck mass energy equivalent in GeV                        1.220 932 e19            0.000 073 e19            GeV
Planck temperature                                          1.416 833 e32            0.000 085 e32            K
Planck time                                                 5.391 06 e-44            0.000 32 e-44            s
proton charge to mass quotient                              9.578 833 58 e7          0.000 000 21 e7          C kg^-1
proton Compton wavelength                                   1.321 409 856 23 e-15    0.000 000 000 94 e-15    m
proton Compton wavelength over 2 pi                         0.210 308 910 47 e-15    0.000 000 000 15 e-15    m
proton-electron mass ratio                                  1836.152 672 45          0.000 000 75
proton g factor                                             5.585 694 713            0.000 000 046
proton gyromag. ratio                                       2.675 222 005 e8         0.000 000 063 e8         s^-1 T^-1
proton gyromag. ratio over 2 pi                             42.577 4806              0.000 0010               MHz T^-1
proton mag. mom.                                            1.410 606 743 e-26       0.000 000 033 e-26       J T^-1
proton mag. mom. to Bohr magneton ratio                     1.521 032 210 e-3        0.000 000 012 e-3
proton mag. mom. to nuclear magneton ratio                  2.792 847 356            0.000 000 023
proton mag. shielding correction                            25.694 e-6               0.014 e-6
proton mass                                                 1.672 621 777 e-27       0.000 000 074 e-27       kg
proton mass energy equivalent                               1.503 277 484 e-10       0.000 000 066 e-10       J
proton mass energy equivalent in MeV                        938.272 046              0.000 021                MeV
proton mass in u                                            1.007 276 466 812        0.000 000 000 090        u
proton molar mass                                           1.007 276 466 812 e-3    0.000 000 000 090 e-3    kg mol^-1
proton-muon mass ratio                                      8.880 243 31             0.000 000 22
proton-neutron mag. mom. ratio                              -1.459 898 06            0.000 000 34
proton-neutron mass ratio                                   0.998 623 478 26         0.000 000 000 45
proton rms charge radius                                    0.8775 e-15              0.0051 e-15              m
proton-tau mass ratio                                       0.528 063                0.000 048
quantum of circulation                                      3.636 947 5520 e-4       0.000 000 0024 e-4       m^2 s^-1
quantum of circulation times 2                              7.273 895 1040 e-4       0.000 000 0047 e-4       m^2 s^-1
Rydberg constant                                            10 973 731.568 539       0.000 055                m^-1
Rydberg constant times c in Hz                              3.289 841 960 364 e15    0.000 000 000 017 e15    Hz
Rydberg constant times hc in eV                             13.605 692 53            0.000 000 30             eV
Rydberg constant times hc in J                              2.179 872 171 e-18       0.000 000 096 e-18       J
Sackur-Tetrode constant (1 K, 100 kPa)                      -1.151 7078              0.000 0023
Sackur-Tetrode constant (1 K, 101.325 kPa)                  -1.164 8708              0.000 0023
second radiation constant                                   1.438 7770 e-2           0.000 0013 e-2           m K
shielded helion gyromag. ratio                              2.037 894 659 e8         0.000 000 051 e8         s^-1 T^-1
shielded helion gyromag. ratio over 2 pi                    32.434 100 84            0.000 000 81             MHz T^-1
shielded helion mag. mom.                                   -1.074 553 044 e-26      0.000 000 027 e-26       J T^-1
shielded helion mag. mom. to Bohr magneton ratio            -1.158 671 471 e-3       0.000 000 014 e-3
shielded helion mag. mom. to nuclear magneton ratio         -2.127 497 718           0.000 000 025
shielded helion to proton mag. mom. ratio                   -0.761 766 558           0.000 000 011
shielded helion to shielded proton mag. mom. ratio          -0.761 786 1313          0.000 000 0033
shielded proton gyromag. ratio                              2.675 153 268 e8         0.000 000 066 e8         s^-1 T^-1
shielded proton gyromag. ratio over 2 pi                    42.576 3866              0.000 0010               MHz T^-1
shielded proton mag. mom.                                   1.410 570 499 e-26       0.000 000 035 e-26       J T^-1
shielded proton mag. mom. to Bohr magneton ratio            1.520 993 128 e-3        0.000 000 017 e-3
shielded proton mag. mom. to nuclear magneton ratio         2.792 775 598            0.000 000 030
speed of light in vacuum                                    299 792 458              (exact)                  m s^-1
standard acceleration of gravity                            9.806 65                 (exact)                  m s^-2
standard atmosphere                                         101 325                  (exact)                  Pa
standard-state pressure                                     100 000                  (exact)                  Pa
Stefan-Boltzmann constant                                   5.670 373 e-8            0.000 021 e-8            W m^-2 K^-4
tau Compton wavelength                                      0.697 787 e-15           0.000 063 e-15           m
tau Compton wavelength over 2 pi                            0.111 056 e-15           0.000 010 e-15           m
tau-electron mass ratio                                     3477.15                  0.31
tau mass                                                    3.167 47 e-27            0.000 29 e-27            kg
tau mass energy equivalent                                  2.846 78 e-10            0.000 26 e-10            J
tau mass energy equivalent in MeV                           1776.82                  0.16                     MeV
tau mass in u                                               1.907 49                 0.000 17                 u
tau molar mass                                              1.907 49 e-3             0.000 17 e-3             kg mol^-1
tau-muon mass ratio                                         16.8167                  0.0015
tau-neutron mass ratio                                      1.891 11                 0.000 17
tau-proton mass ratio                                       1.893 72                 0.000 17
Thomson cross section                                       0.665 245 8734 e-28      0.000 000 0013 e-28      m^2
triton-electron mass ratio                                  5496.921 5267            0.000 0050
triton g factor                                             5.957 924 896            0.000 000 076
triton mag. mom.                                            1.504 609 447 e-26       0.000 000 038 e-26       J T^-1
triton mag. mom. to Bohr magneton ratio                     1.622 393 657 e-3        0.000 000 021 e-3
triton mag. mom. to nuclear magneton ratio                  2.978 962 448            0.000 000 038
triton mass                                                 5.007 356 30 e-27        0.000 000 22 e-27        kg
triton mass energy equivalent                               4.500 387 41 e-10        0.000 000 20 e-10        J
triton mass energy equivalent in MeV                        2808.921 005             0.000 062                MeV
triton mass in u                                            3.015 500 7134           0.000 000 0025           u
triton molar mass                                           3.015 500 7134 e-3       0.000 000 0025 e-3       kg mol^-1
triton-proton mass ratio                                    2.993 717 0308           0.000 000 0025
unified atomic mass unit                                    1.660 538 921 e-27       0.000 000 073 e-27       kg
von Klitzing constant                                       25 812.807 4434          0.000 0084               ohm
weak mixing angle                                           0.2223                   0.0021
Wien frequency displacement law constant                    5.878 9254 e10           0.000 0053 e10           Hz K^-1
Wien wavelength displacement law constant                   2.897 7721 e-3           0.000 0026 e-3           m K
