# Sakuma–Hattori equation

Template:Tnavbar-header Symbol Value[1][2] (SI units) Relative Standard Uncertainty
magnetic constant (vacuum permeability) ${\displaystyle \mu _{0}\,}$ 4π × 10−7 N·A−2 = 1.256 637 061... × 10−6 N·A−2 defined
electric constant (vacuum permittivity) ${\displaystyle \varepsilon _{0}=1/\mu _{0}c^{2}\,}$ 8.854 187 817... × 10−12 F·m−1 defined
characteristic impedance of vacuum ${\displaystyle Z_{0}=\mu _{0}c\,}$ 376.730 313 461... Ω defined
Coulomb's constant ${\displaystyle k_{\mathrm {e} }=1/4\pi \varepsilon _{0}\,}$ 8.987 551 787... × 109 N·m²·C−2 defined
elementary charge ${\displaystyle e\,}$ 1.602 176 565(35) × 10−19 C 2.2 × 10−8
Bohr magneton ${\displaystyle \mu _{\mathrm {B} }=e\hbar /2m_{e}}$ 9.274 009 68(20) × 10−24 J·T−1 2.2 × 10−8
conductance quantum ${\displaystyle G_{0}=2e^{2}/h\,}$ 7.748 091 7346(25) × 10−5 S 3.2 × 10−10
inverse conductance quantum ${\displaystyle G_{0}^{-1}=h/2e^{2}\,}$ 12 906.403 7217(42) Ω 3.2 × 10−10
Josephson constant ${\displaystyle K_{\mathrm {J} }=2e/h\,}$ 4.835 978 70(11) × 1014 Hz·V−1 2.2 × 10−8
magnetic flux quantum ${\displaystyle \phi _{0}=h/2e\,}$ 2.067 833 758(46) × 10−15 Wb 2.2 × 10−8
nuclear magneton ${\displaystyle \mu _{\mathrm {N} }=e\hbar /2m_{p}}$ 5.050 783 53(11) × 10−27 J·T−1 2.2 × 10−8
von Klitzing constant ${\displaystyle R_{\mathrm {K} }=h/e^{2}\,}$ 25 812.807 4434(84) Ω 3.2 × 10−10

1. The values are given in the so-called concise form; the number in brackets is the standard uncertainty, which is the value multiplied by the relative standard uncertainty.
2. P.J. Mohr, B.N. Taylor, and D.B. Newell (2011), "The 2010 CODATA Recommended Values of the Fundamental Physical Constants" (Web Version 6.0). This database was developed by J. Baker, M. Douma, and S. Kotochigova. Available: http://physics.nist.gov/constants [Thursday, 02-Jun-2011 21:00:12 EDT]. National Institute of Standards and Technology, Gaithersburg, MD 20899.