| Physical quantity | Unit name | Unit symbol | Expression in SI units |
|---|---|---|---|
| energy | erg | erg | 10-7 J |
| force | dyne | dyn | 10-5 N |
| dynamic viscosity | poise | P | dyn s cm-2 = 0.1 Pa s |
| kinematic viscosity | stokes | St | cm2 s-1 = 10-4 m2 s-1 |
| magnetic induction | gauss | G | 10-4 T |
| magnetic field strength | oersted | Oe | (1000/4π) A m-1 |
| magnetic flux | maxwell | Mx | 10-8 Wb |
| luminance | stilb | sb | cd cm-2 = 104 cd m-2 |
| illumination | phot | ph | 104 lx |
| acceleration (due to gravity) | gal | Gal | 1 cm s-2 = 10-2 m s-2 |
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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