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FUNDAMENTAL PHYSICAL CONSTANTS

April 20, 2012
 Quantity                                               Value                 Uncertainty          Unit Reference
————————————————————————————————————————
{220} lattice spacing of silicon                       192.015 5714 e-12     0.000 0032 e-12       m X-RAY
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 X-RAY
atomic mass constant                                   1.660 538 921 e-27    0.000 000 073 e-27    kg PHYS-CHEM
atomic mass constant energy equivalent                 1.492 417 954 e-10    0.000 000 066 e-10    J PHYS-CHEM
atomic mass constant energy equivalent in MeV          931.494 061           0.000 021             MeV PHYS-CHEM
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 ELEC-MAGN
Bohr magneton in eV/T                                  5.788 381 8066 e-5    0.000 000 0038 e-5    eV T^-1 ELEC-MAGN
Bohr magneton in Hz/T                                  13.996 245 55 e9      0.000 000 31 e9       Hz T^-1 ELEC-MAGN
Bohr magneton in inverse meters per tesla              46.686 4498           0.000 0010            m^-1 T^-1 ELEC-MAGN
Bohr magneton in K/T                                   0.671 713 88          0.000 000 61          K T^-1 ELEC-MAGN
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 PHYS-CHEM
Boltzmann constant in eV/K                             8.617 3324 e-5        0.000 0078 e-5        eV K^-1 PHYS-CHEM
Boltzmann constant in Hz/K                             2.083 6618 e10        0.000 0019 e10        Hz K^-1 PHYS-CHEM
Boltzmann constant in inverse meters per kelvin        69.503 476            0.000 063             m^-1 K^-1 PHYS-CHEM
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 ELEC-MAGN
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 X-RAY
electric constant                                      8.854 187 817… e-12 (exact)               F m^-1
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 ELEC-MAGN
elementary charge over h                               2.417 989 348 e14     0.000 000 053 e14     A J^-1 ELEC-MAGN
Faraday constant                                       96 485.3365           0.0021                C mol^-1 PHYS-CHEM
Faraday constant for conventional electric current     96 485.3321           0.0043                C_90 mol^-1
first radiation constant                               3.741 771 53 e-16     0.000 000 17 e-16     W m^2 PHYS-CHEM
first radiation constant for spectral radiance         1.191 042 869 e-16    0.000 000 053 e-16    W m^2 sr^-1 PHYS-CHEM
hartree-atomic mass unit relationship                  2.921 262 3246 e-8    0.000 000 0021 e-8    u
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
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 ELEC-MAGN
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 X-RAY
lattice parameter of silicon                           543.102 0504 e-12     0.000 0089 e-12       m PHYS-CHEM
Loschmidt constant (273.15 K, 100 kPa)                 2.651 6462 e25        0.000 0024 e25        m^-3 PHYS-CHEM
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 ELEC-MAGN
molar gas constant                                     8.314 4621            0.000 0075            J mol^-1 K^-1 PHYS-CHEM
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 PHYS-CHEM
molar Planck constant times c                          0.119 626 565 779     0.000 000 000 084     J m mol^-1 PHYS-CHEM
molar volume of ideal gas (273.15 K, 100 kPa)          22.710 953 e-3        0.000 021 e-3         m^3 mol^-1 PHYS-CHEM
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 PHYS-CHEM
molar volume of silicon                                12.058 833 01 e-6     0.000 000 80 e-6      m^3 mol^-1 X-RAY
Mo x unit                                              1.002 099 52 e-13     0.000 000 53 e-13     m X-RAY
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
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 ELEC-MAGN
nuclear magneton in eV/T                               3.152 451 2605 e-8    0.000 000 0022 e-8    eV T^-1 ELEC-MAGN
nuclear magneton in inverse meters per tesla           2.542 623 527 e-2     0.000 000 056 e-2     m^-1 T^-1 ELEC-MAGN
nuclear magneton in K/T                                3.658 2682 e-4        0.000 0033 e-4        K T^-1 ELEC-MAGN
nuclear magneton in MHz/T                              7.622 593 57          0.000 000 17          MHz T^-1 ELEC-MAGN
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
Sackur-Tetrode constant (1 K, 100 kPa)                 -1.151 7078           0.000 0023 PHYS-CHEM
Sackur-Tetrode constant (1 K, 101.325 kPa)             -1.164 8708           0.000 0023 PHYS-CHEM
second radiation constant                              1.438 7770 e-2        0.000 0013 e-2        m K PHYS-CHEM
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 PHYS-CHEM
Thomson cross section                                  0.665 245 8734 e-28   0.000 000 0013 e-28   m^2
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 ELEC-MAGN
Wien frequency displacement law constant               5.878 9254 e10        0.000 0053 e10        Hz K^-1 PHYS-CHEM
Wien wavelength displacement law constant              2.897 7721 e-3        0.000 0026 e-3        m K PHYS-CHEM
AccelerationDueToGravity 9.8

0

m/s^2
AgeOfUniverse 4.339 10^17 s
BohrRadius 5.291772 17×10−11 m
EarthMass 6.378 140 10^6 m
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