Its subsystems ( CGS-ESU, CGS-EMU and CGS-Gaussian) have different defining equations for their systems of quantities for defining electromagnetic quantities and hence the associated units, with CGS-Gaussian units being selected from each of the other two subsystems. The centimetre–gram–second system of units (CGS) is based on three base units: centimetre, gram and second. Main article: centimetre–gram–second system of units Systems are listed with named units that are associated with them. There are several metric systems, most of which have become disused or are still used in only niche disciplines. For mass, the same prefixes are applied to the gram (g) instead of the kilogram. The katal (kat) is equal to one mole per second ( 1 mol/s).įurthermore, there are twenty-four metric prefixes that can be combined with any of these units except one (1) and kilogram (kg) to form further units of the SI.The sievert (Sv) is equal to one joule per kilogram ( 1 J/kg).The gray (Gy) is equal to one joule per kilogram ( 1 J/kg).The becquerel (Bq) is equal to one reciprocal second ( 1 s −1).The lux (lx) is equal to one lumen per square metre ( 1 lm/m 2).The lumen (lm) is equal to one candela-steradian ( 1 cd⋅sr).The degree Celsius (☌) is equal to one kelvin ( 1 K).The henry (H) is equal to one volt-second per ampere ( 1 V⋅s/A).The siemens (S) is equal to one ampere per volt ( 1 A/V).The ohm (Ω) is equal to one volt per ampere ( 1 V/A).The farad (F) is equal to one coulomb per volt ( 1 C/V).
The tesla (T) is equal to one weber per square metre ( 1 Wb/m 2).The weber (Wb) is equal to one volt-second ( 1 V⋅s).The volt (V) is equal to one joule per coulomb ( 1 J/C).The coulomb (C) is equal to one ampere second ( 1 A⋅s).The watt (W) is equal to one joule per second ( 1 J/s).The joule (J) is equal to one newton-metre ( 1 N⋅m).The pascal (Pa) is equal to one newton per square metre ( 1 N/m 2).The newton (N) is equal to one kilogram-metre per second squared ( 1 kg⋅m⋅s −2).The steradian (sr) is equal to one ( 1).The hertz (Hz) is equal to one reciprocal second ( 1 s −1).The SI also defines 22 derived units and associated symbols: The candela (cd) is the unit of luminous intensity.The mole (mol) is the unit of amount of substance.
The SI defines 7 base units and associated symbols: It is the neutral element of any system of units. The unit one (1) is the unit of a quantity of dimension one. In its most restrictive interpretation, this is what may be meant when the term metric unit is used. The first group of metric units are those that are at present defined as units within the International System of Units (SI). Main article: International System of Units
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