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UNITS FOR MAGNETIC PROPERTIES
Conversion from CGS to SI Units
Quantity
Magnetic flux density,
Magnetic induction
Magnetic Flux
Magnetic potential difference,
magnetomotive force
Magnetic field strength,
magnetizing force
(Volume) magnetization
(Volume) magnetization
Magnetic polarization,
intensity of
magnetization
(Mass) magnetization
Magnetic moment
Magnetic dipole moment
(Volume) susceptibility
(Mass) susceptibility
(Molar) susceptibility
Permeability
j
Relative permeability
(Volume) energy density,
k
energy product
Demagnetization factor
NOTES:
a.
Gaussian units and cgs emu are the same for magnetic properties. The defining relation is B = H + 4 M.
b.
Multiply a number in Gaussian units by C to convert it to SI (e.g. 1 G x 10
c.
SI (Système International d'Unités) has been adopted by the National Bureau of Standards. Where two conversion factors are given, the upper
one is recognized under, or consistent with, SI and is based on the definition B = µ
recognized under SI and is based on the definition B = µ
5
d.
1 gauss = 10
gamma ( ).
e.
Both oersted and gauss are expressed as cm
f.
A/m was often expressed as "ampere-turn per meter" when used for magnetic field strength.
g.
Magnetic moment per unit volume.
h.
The designation "emu" is not a unit.
i.
Recognized uder SI, even thoug based on the definition B = µ
j.
µ
= µ/µ
= 1 + , all in SI. µ
r
0
k.
B • H and µ
M • H have SI units J/m
0
R.B. Goldfarb and F.R. Fickett, U.S. Department of Commerce, National Bureau of Standards, Bolder, Colorado 80303, March 1985, NBS Special
Publication 696. For sale by the Superintendent of Documents, U.S. Government Printing Office, Washington, D.C. 20402.
Magnetic Units
Lake Shore Model 647 Magnet Power Supply User's Manual
APPENDIX A
Gaussian
Symbol
& CGS emu
B
gauss (G)
maxwell (Mx), G•cm2
U, F
gilbert (Gb)
H
oersted (Oe),
g
M
4 M
J, I
, M
m
emu, erg/G
j
emu, erg/G
dimensionless
,
,
cm
3
,
cm
mol
mol
µ
dimensionless
µ
not defined
r
W
D, N
dimensionless
H + J, where the symbol I is often used in place of J.
0
-½
½
-1
•g
•s
in terms of base units.
is equal to Gaussian µ.
r
3
, M • H and B • H/4 have Gaussian units erg/cm
Conversion
a
Factor, C
d
10
10-8
10/4
e
Gb/cm
10
3h
emu/cm
10
G
10
3
emu/cm
4 x 10
emu/g
4 x 10
10
4 x 10
3
2
emu/cm
(4 )
4 x 10
3
/g, emu/g
(4 )2 x 10
4 x 10
/mol, emu/mol
2
(4 )
4 x 10
3
erg/cm
10
1/4
-4
-4
T/G = 10
T).
(H + M), where to µ
0
H + J. See footnote c.
0
3
.
SI &
b
Rationalized mks
tesla (T), Wb/m
-4
weber (Wb), volt
second (V•s)
ampere (A)
3
f
/4
A/m
3
A/m
3
/4
A/m
-4
2i
T, Wb/m
2
1
A•m
/kg
-7
Wb•m/kg
2
A•m
, joule per
-3
tesla (J/T)
-10
i
Wb•m
-
Henry per meter
-7
x 10
(H/m), Wb/(A•m)
-3
3
m
/kg
-10
2
H•m
/kg
-6
3
m
/mol
-13
2
x 10
H•m
/mol
-7
H/m, Wb/(A•m)
-
dimensionless
-1
3
J/m
dimensionless
-7
= 4 x 10
H/m. The lower one is not
0
c
2
A-1
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