|Unit system||Gaussian and emu-cgs|
|Unit of||magnetic flux density (also known as magnetic induction, or the B-field, or magnetic field)|
|Symbol||G or Gs|
|Named after||Carl Friedrich Gauss|
|SI derived units|
|esu-cgs||1/ccgs esu[Note 1]|
The gauss, symbol (sometimes Gs), is a unit of measurement of magnetic induction, also known as magnetic flux density. The unit is part of the Gaussian system of units, which inherited it from the older CGS-EMU system. It was named after the German mathematician and physicist Carl Friedrich Gauss in 1936. One gauss is defined as one maxwell per square centimeter.
As the cgs system has been superseded by the International System of Units (SI), the use of the gauss has been deprecated by the standards bodies, but is still regularly used in various subfields of science. The SI unit for magnetic flux density is the tesla (symbol T), which corresponds to 10,000gauss.
Albeit not a component of the International System of Units, the usage of the gauss generally follows the rules for SI units. Since the name is derived from a person's name, its symbol is the uppercase letter G. When the unit is spelled out, it is written in lowercase ("gauss"), unless it begins a sentence.:147-148 The gauss may be combined with metric prefixes,:128 such as in milligauss, mG (or mGs).
The gauss is the unit of magnetic flux density B in the system of Gaussian units and is equal to Mx/cm2 or g/Bi/s2, while the oersted is the unit of H-field. One tesla (T) corresponds to 104 gauss, and one ampere (A) per meter corresponds to 4? × 10-3 oersted.
The units for magnetic flux ?, which is the integral of magnetic B-field over an area, are the weber (Wb) in the SI and the maxwell (Mx) in the CGS-Gaussian system. The conversion factor is 108, since flux is the integral of field over an area, area having the units of the square of distance, thus 104 (magnetic field conversion factor) times the square of 102 (linear distance conversion factor, i.e., centimetres per meter). 108 = 104 × (102)2.