Data:CODATA Recommended Values of the Fundamental Physical Constants 2006
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Further information: CODATA Recommended Values of the Fundamental Physical Constants
| Quantity | Symbol | Value | ur |
|---|---|---|---|
| Speed of light in vacuum | c, c0 | 299 792 458 m s−1 | exact[note 1] |
| Magnetic constant | μ0 | 4π × 10−7 H m−1 ≈ 1.256 637 061… × 10−6 H m−1 |
exact[note 2] |
| Electric constant | ε0 = (μ0c20)−1 | 8.854 187 816… × 10−12 F m−1 | exact[note 2] |
| Newtonian constant of gravitation | G | 6.674 28(67) × 10−11 N m2 kg−2 | 1.0 × 10−4 |
| Planck constant | h ħ = h/2π |
6.626 068 96(33) × 10−34 J s 1.054 551 628(53) × 10−34 J s |
5.0 × 10−8 5.0 × 10−8 |
| Elementary charge | e | 1.602 176 487(40) × 10−19 C | 2.5 × 10−8 |
| Magnetic flux quantum | Φ0 = h/2e | 2.067 833 667(52) × 10−15 Wb | 2.5 × 10−8 |
| Conductance quantum | G0 = 2e2/h | 7.748 091 7004(53) × 10−5 S | 6.8 × 10−10 |
| Electron mass | me | 5.485 799 0943(23) × 10−4 u = 9.109 382 15(45) × 10−31 kg |
4.2 × 10−10 5.0 × 10−8 |
| Proton mass | mp | 1.007 276 466 77(10) u 1.672 621 637(83) × 10−27 kg |
1.0 × 10−10 5.0 × 10−8 |
| Proton–electron mass ratio | mp/me | 1836.152 672 47(80) | 4.3 × 10−10 |
| Fine structure constant | α = μ0c0e2/2h α−1 |
7.297 352 5376(50) × 10−3 137.035 999 679(94) |
6.8 × 10−10 6.8 × 10−10 |
| Rydberg constant | R∞ | 10 973 731.568 527(73) m−1 | 6.6 × 10−12 |
| Avogadro constant | NA | 6.022 141 79(30) × 1023 mol−1 | 5.0 × 10−8 |
| Faraday constant | F = NAe | 96 485.3399(24) C mol−1 | 2.5 × 10−8 |
| Molar gas constant | R | 8.314 472(15) J K−1 mol−1 | 1.7 × 10−6 |
| Boltzmann constant | k = R/NA | 1.380 6504(24) × 10−23 J K−1 | 1.7 × 10−6 |
| Stefan–Bolzmann constant | σ = (π2/60)k4/ħ3c20 | 5.670 400(40) × 10−8 W m−2 K−4 | 7.0 × 10−6 |
| (Unified) atomic mass unit | u | 1.660 538 782(83) × 10−27 kg | 5.0 × 10−8 |
Notes
- ↑ The numerical value of the speed of light in vacuum is fixed by the definition of the metre.
- ↑ 2.0 2.1 The numerical values of the magnetic constant and the electric constant are fixed by the definitions of the ampere and the metre. They may be expressed to any desired number of significant figures using the relationships given here.
Reference
Mohr, Peter J.; Taylor, Barry N.; Newell, David B. CODATA Recommended Values of the Fundamental Physical Constants: 2006. Rev. Mod. Phys. 2008, 80 (2), 633–730. doi:10.1103/RevModPhys.80.633, <http://physics.nist.gov/cuu/Constants/codata.pdf>.
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