# Derived CGS Units with Special Names

Physical quantityUnit nameUnit symbolExpression in SI units
energyergerg10-7 J
forcedynedyn10-5 N
dynamic viscositypoisePdyn s cm-2 = 0.1 Pa s
kinematic viscositystokesSt cm2 s-1 = 10-4 m2 s-1
magnetic inductiongaussG10-4 T
magnetic field strengthoerstedOe(1000/4π) A m-1
magnetic fluxmaxwellMx10-8 Wb
luminancestilbsb cd cm-2 = 104 cd m-2
illuminationphotph104 lx
acceleration
(due to gravity)
galGal 1 cm s-2 = 10-2 m s-2
Table 8. Derived CGS Units with Special Names.

Some non-SI units are still occasionally used. Some are important for the interpretation of older scientific texts, but their use is not encouraged. The above table shows the relationship between CGS units and the SI, and lists those CGS units that were assigned special names. In the field of mechanics, the CGS system of units was built upon three quantities and the corresponding base units: the centimetre, the gram and the second. In the field of electricity and magnetism, units were expressed in terms of these three base units. Because this can be done in different ways, it led to the establishment of several different systems, for example, the CGS Electrostatic System, the CGS Electromagnetic System and the CGS Gaussian System. In these three last-mentioned systems, the system of quantities and the corresponding system of equations differ from those used with SI units.

Si Units:

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