BIPM - Table 9

SI brochure, Table 9 (Section 4.1)

Table 9. Non-SI units associated with the CGS and the CGS-Gaussian system of units

Quantity

Name of unit

Symbol for unit

Value in SI units

energy

erg ^(a)

erg

1 erg = 10^–7 J

force

dyne ^(a)

dyn

1 dyn = 10^–5 N

dynamic viscosity

poise ^(a)

1 P = 1 dyn s cm^–2 = 0.1 Pa s

kinematic viscosity

stokes

1 St = 1 cm² s^–1 = 10^–4 m² s^–1

luminance

stilb ^(a)

1 sb = 1 cd cm^–2 = 10⁴ cd m^–2

illuminance

phot

1 ph = 1 cd sr cm^–2 = 10⁴ lx

acceleration

gal ^(b)

Gal

1 Gal = 1 cm s^–2 = 10^–2 m s^–2

magnetic flux

maxwell ^(c)

1 Mx = 1 G cm² = 10^–8 Wb

magnetic flux density

gauss ^(c)

1 G = 1 Mx cm^–2 = 10^–4 T

magnetic field

œrsted ^(c)

1 Oe $corresponds to$ (10³/4

) A m^–1

(a)	This unit and its symbol were included in Resolution 7 of the 9th CGPM (1948).
(b)	The gal is a special unit of acceleration employed in geodesy and geophysics to express acceleration due to gravity.
(c)	These units are part of the so-called "electromagnetic" three-dimensional CGS system based on unrationalized quantity equations, and must be compared with care to the corresponding unit of the International System which is based on rationalized equations involving four dimensions and four quantities for electromagnetic theory. The magnetic flux, , and the magnetic flux density, B, are defined by similar equations in the CGS system and the SI, so that the corresponding units can be related as in the table. However, the unrationalized magnetic field, H (unrationalized) = 4 x H (rationalized). The equivalence symbol $corresponds to$ is used to indicate that when H (unrationalized) = 1 Oe, H (rationalized) = (10³/4) A m^–1.