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Section: 1 | Units For Magnetic Properties |
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John R. Rumble, ed., CRC Handbook of Chemistry and Physics, 103rd Edition (Internet Version 2022), CRC Press/Taylor & Francis, Boca Raton, FL.
If a specific table is cited, use the format: "Physical Constants of Organic Compounds," in CRC Handbook of Chemistry and Physics, 103rd Edition (Internet Version 2022), John R. Rumble, ed., CRC Press/Taylor & Francis, Boca Raton, FL.

UNITS FOR MAGNETIC PROPERTIES

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Units For Magnetic Properties



QuantitySymbolGaussian & cgs emu aConversion factor, C bSI & rationalized mks c
Continued on next page...
Magnetic flux density, magnetic inductionBgauss (G)d10-4tesla (T), Wb/m2
Magnetic fluxΦmaxwell (Mx), G ⋅ cm210-8weber (Wb), volt second (V ⋅ s)
Magnetic potential difference, magnetomotive forceU, Fgilbert (Gb)10/4πampere (A)
Magnetic field strength, magnetizing forceHoersted (Oe)e, Gb/cm103/4πA/mf
(Volume) magnetizationgMemu/cm3 h103A/m
(Volume) magnetization4πMG103/4πA/m
Magnetic polarization, intensity of magnetizationJ, Iemu/cm34π × 10-4T, Wb/m2 i
(Mass) magnetizationσ, Memu/g1A ⋅ m2/kg
4π × 10-7Wb ⋅ m/kg
Magnetic moment memu, erg/G10-3A ⋅ m2, joule per tesla (J/T)
Magnetic dipole momentjemu, erg/G4π × 10-10Wb ⋅ m i
(Volume) susceptibilityχ, κdimensionless, emu/cm34πdimensionless
(4π)2 × 10-7henry per meter (H/m), Wb/(A ⋅ m)
(Mass) susceptibilityχρ, κρcm3/g, emu/g4π × 10-3m3/kg
(4π)2 × 10-10H ⋅ m2/kg
(Molar) susceptibilityχmol, κmolcm3/mol, emu/mol4π × 10-6m3/mol
(4π)2× 10-13H ⋅ m2/mol
Permeabilityµdimensionless4π × 10-7H/m, Wb/(A ⋅ m)
Relative permeabilityjµrnot defineddimensionless

  • aGaussian units and cgs emu are the same for magnetic properties. The defining relation is B = H + 4πM.
  • bMultiply a number in Gaussian units by C to convert it to SI (e.g., 1 G × 10-4 T/G = 10-4 T).
  • cSI (Système International d’Unités) has been adopted by the National Institute of Standards and Technology. Where two conversion factors are given, the upper one is recognized under, or consistent with, SI and is based on the definition B = μ0(H + M), where μ0 = 4π × 10-7 H/M. The lower one is not recognized under SI and is based on the definition B = μ0 H + J, where the symbol I is often used in place of J.
  • d1 gauss = 105 gamma (γ).
  • eBoth oersted and gauss are expressed as cm-½⋅g½⋅s-1 in terms of base units.
  • fA/m was often expressed as “ampere–turn per meter” when used for magnetic field strength.
  • gMagnetic moment per unit volume.
  • hThe designation “emu” is not a unit.
  • iRecognized under SI, even though based on the definition B = μ0H + J. See footnote c.
  • jμr = μ/μ0 = 1+χ, all in SI. μr is equal to Gaussian μ.
  • kB⋅H and μ0M⋅H have SI units J/m3; M⋅H and B⋅H/4π have Gaussian units erg/cm3.


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