Physical Constant - Table of Electromagnetic Constants

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 e \, 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

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