
Direct access 





SI brochure, Table 9 ( Section 4.1)

Table 9. NonSI units associated with the CGS and the CGSGaussian 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)} 
P 
1 P = 1 dyn s cm^{–2} = 0.1 Pa s 
kinematic viscosity 
stokes 
St 
1 St = 1 cm^{2} s^{–1} = 10^{–4} m^{2} s^{–1} 
luminance 
stilb ^{(a)} 
sb 
1 sb = 1 cd cm^{–2} = 10^{4} cd m^{–2} 
illuminance 
phot 
ph 
1 ph = 1 cd sr cm^{–2} = 10^{4} lx 
acceleration 
gal ^{(b)} 
Gal 
1 Gal = 1 cm s^{–2} = 10^{–2} m s^{–2} 
magnetic flux 
maxwell ^{(c)} 
Mx 
1 Mx = 1 G cm^{2} = 10^{–8} Wb 
magnetic flux density 
gauss ^{(c)} 
G 
1 G = 1 Mx cm^{–2} = 10^{–4} T 
magnetic field 
œrsted ^{(c)} 
Oe 
1 Oe (10^{3}/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 socalled "electromagnetic" threedimensional 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 is used to indicate that when H (unrationalized) = 1 Oe, H (rationalized) = (10^{3}/4) A m^{–1}. 








