Table of Electromagnetic Constants
| Quantity | Symbol | Value (SI units) | Relative Standard Uncertainty |
|---|---|---|---|
| magnetic constant (vacuum permeability) | 4π × 10−7 N·A−2 = 1.256 637 061... × 10−6 N·A−2 | defined | |
| electric constant (vacuum permittivity) | 8.854 187 817... × 10−12 F·m−1 | defined | |
| characteristic impedance of vacuum | 376.730 313 461... Ω | defined | |
| Coulomb's constant | 8.987 551 787... × 109 N·m²·C−2 | defined | |
| elementary charge |  |
1.602 176 565(35) × 10−19 C | 2.2 × 10−8 |
| Bohr magneton | 9.274 009 68(20) × 10−24 J·T−1 | 2.2 × 10−8 | |
| conductance quantum | 7.748 091 7346(25) × 10−5 S | 3.2 × 10−10 | |
| inverse conductance quantum | 12 906.403 7217(42) Ω | 3.2 × 10−10 | |
| Josephson constant | 4.835 978 70(11) × 1014 Hz·V−1 | 2.2 × 10−8 | |
| magnetic flux quantum | 2.067 833 758(46) × 10−15 Wb | 2.2 × 10−8 | |
| nuclear magneton | 5.050 783 53(11) × 10−27 J·T−1 | 2.2 × 10−8 | |
| von Klitzing constant | 25 812.807 4434(84) Ω | 3.2 × 10−10 |
Read more about this topic: Physical Constant
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“Remember thee?
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I’ll wipe away all trivial fond records,
All saws of books, all forms, all pressures past
That youth and observation copied there,
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—William Shakespeare (1564–1616)