# Magnetic Units Conversion Table

UNITS

FOR

MAGNETIC

PROPERTIES

Quantity

Magnetic flux density,

magnetic induction

Magnetic flux

Magnetic potential difference,

ma~netomotive

force

Magnetic field strength,

,magnetizing force

(Volume) magnetization

g

(Volume) magnetization

Magnetic polarization,

intensity

of

magnetization

(Mass) magnetization

Magnetic moment

Magnetic dipole moment

(V

01

ume) susceptibility

Symbol

B

U,F

H

M

477M

1,1

(F,

M

m

j

Gaussian

& cgs emu a

gauss

(0)

d

maxwell (Mx), G·cm

2

gilbert (Gb)

oersted

(Oe),e

Gb/cm

emu/cm

3

h

G

emu/cm

3

emu/g

emu,

erg/G

emu,

erg/G

dimensionless,

emu/cm

3

Conversion

factor, C

b

10-

4

10/477

477

X

10-

4

1

477

X

10-

7

10-

3

477

X

10-

10

SI & rationalized mks C

tesla (T),

Wb/m

2

weber (Wb), volt second (V·s)

ampere

(A)

A/m!

A/m

A/m

T,

Wb/m

2i

A.m

2

/kg

Wb·m/kg

A.m

2

,

joule per tesla

(l/T)

Wb·m'

dimensionless

henry per meter

(H/m),

Wb/(A.m)

(Mass) susceptibility

(Molar) susceptibility

Permeability

Relative permeability

j

(Volume) energy density,

energy product k

Demagnetization factor

cm

3

/g,

emu/g

477

X

10-

3

m

3

/kg

Xp, K

p

(477)2

X

10-

10

H.m

2

/kg

cm

3

/mol, emu/mol

477

X

10-

6

m

3

/mol

Xmo},

K

mo

]

(477)2

X

10-

l3

H·m

2

/mol

1J-

dimensionless

477

X

10-

7

H/m,

Wb/(A·m)

1J-r

not defined dimensionless

W

erg/cm

3

10-

l

J/m

3

D,N

dimensionless

1/477

dimensionless

a.

Gaussian units and cgs emu are the same for magnetic properties.

The

defining relation

is

B

=H

+

477M.

b.

Multiply a number in Gaussian units by C to convert it to SI (e.g., 1 G X

10-

4

T

/G

=

10-

4

T).

c.

SI (Systeme International d'Unites) 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 =

1J-o(H

+M), where

1J-o

=

477

X

10-

7

H/m.

The

lower one

is

not recognized under SI and

is

based on the definition B

=1J-oll

+J, where the symbol

I

is

often used

in

place

of

J.

d.

1gauss=

10

5

gamma (1').

e.

Both oersted and gauss are expressed

as

em

-1I2.

g

1l2.

S

-1

in terms

of

base units.

/.

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 under SI, even though based on the definition B =

1J-oll

+J. See footnote c.

j.

1J-r

=

1J-/1J-o

= 1+

X,

all in SI.

1J-r

is

equal to Gaussian

1J-.

k.

B·H

and

1J-oM·H

have SI units

J/m

3

;

M·H

and

B·H

/477

have Gaussian units

erg/cm

3

.

R.

B.

Goldfarb and F. R. Fickett, U.S.

De~artment

of

Commerce, National Bureau

of

Standards, Boulder, Colorado 80303, March

1985

NBS Special Publication 696

For

sale by the Superintendent

of

Documents, U.S. Government Printing Office, Washington,

DC

20402

Page 1/1

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