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