Values given below are from the CODATA 1998 recommended by the National Institute of Standards and Technology of United States (NIST).
Values contain the (uncertainty) in the last two decimal places given in brackets. Values that do not have this uncertainty listed are exact.
For example: |
| mu | = 1.66053873(13) x 10-27 kg |
| mu | = 1.66053873 x 10-27 kg |
Uncertainty in mu
| = 0.00000013 x 10-27 kg
|
| Name | Symbol | Value |
| Atomic Mass Unit | mu | 1.66053873(13) x 10-27 kg |
 |
| Avogadro's Number | NA | 6.02214199(47) x 1023 mol-1 |
|
| Bohr Magneton |  B | 9.27400899(37) x 10-24 J T-1 |
|
| Bohr Radius | ao | 0.5291772083(19) x 10-10 m |
|
| Boltzmann's Constant | k | 1.3806503(24) x 10-23 J K-1 |
|
| Compton Wavelength |  c | 2.426310215(18) x 10-12 m |
|
| Deuteron Mass | md | 3.34358309(26) x 10-27 kg |
|
| Electric Constant |  o | 8.854187817 x 10-12 F m-1 |
|
| Electron Mass | me | 9.10938188(72) x 10-31 kg |
|
| Electron-Volt | eV | 1.602176462(63) x 10-19 J |
|
| Elementary Charge | e | 1.602176462(63) x 10-19 C |
|
| Faraday Constant | F | 9.64853415(39) x 104 C mol-1 |
|
| Fine Structure Constant |  | 7.297352533(27) x 10-3 |
|
| Hartree Energy | Eh | 4.35974381(34) x 10-18 J |
|
| Hydrogen Ground State | | 13.6057 eV |
|
| Josephson Constant
| Kj | 4.83597898(19) x 1014 Hz V-1 |
|
| Magnetic Constant | o | 4 x 10-7 |
|
| Molar Gas Constant | R | 8.314472(15) J K-1 mol-1 |
|
| Natural Unit of Action |  | 1.054571596(82) x 10-34 J s |
|
| Newtonian Constant of Gravitation | G | 6.673(10) x 10-11 m3 kg-1 s-2 |
|
| Neutron Mass | mn | 1.67492716(13) x 10-27 kg |
|
| Nuclear Magneton | n | 5.05078317(20) x 10-27 J T-1 |
|
| Planck Constant | h | 6.62606876(52) x 10-34 J s
h = 2 |
|
| Planck Length | lp | 1.6160(12) x 10-35 m |
|
| Planck Mass | mp | 2.1767(16) x 10-8 kg |
|
| Planck Time | tp | 5.3906(40) x 10-44 s |
|
| Proton Mass | mP | 1.67262158(13) x 10-27 kg |
|
| Rydberg Constant | RH | 10 9.73731568549(83) x 105 m-1 |
|
| Stefan Boltzmann Constant |  | 5.670400(40) x 10-8 W m-2 K-4 |
|
| Speed of Light in Vacuum | c | 2.99792458 x 108 m s-1 |
|
| Thompson Cross Section | e | 0.665245854(15) x 10-28 m2 |
|
| Wien Displacement Law Constant | b | 2.8977686(51) x 10-3 m K |
|
