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Concept
List of metric units
Summary
Metric units are units based on the metre, gram or second and decimal (power of ten) multiples or sub-multiples of these. The most widely used examples are the units of the International System of Units (SI). By extension they include units of electromagnetism from the CGS and SI units systems, and other units for which use of SI prefixes has become the norm. Other unit systems using metric units include:
International System of Electrical and Magnetic Units
Metre–tonne–second (MTS) system of units
MKS system of units (metre, kilogram, second)
International System of Units
The first group of metric units are those that are at present defined as units within the International System of Units (SI). In its most restrictive interpretation, this is what may be meant when the term metric unit is used.
The unit one (1) is the unit of a quantity of dimension one. It is the neutral element of any system of units.
The SI defines 7 base units and associated symbols:
The unit one (1) is the unit of a quantity of dimension one.
The second (s) is the unit of time.
The metre (m) is the unit of length.
The kilogram (kg) is the unit of mass.
The ampere (A) is the unit of electric current.
The kelvin (K) is the unit of thermodynamic temperature.
The mole (mol) is the unit of amount of substance.
The candela (cd) is the unit of luminous intensity.
The SI also defines 22 derived units and associated symbols:
The hertz (Hz) is equal to one reciprocal second (1s-1).
The radian (rad) is equal to one (1).
The steradian (sr) is equal to one (1).
The newton (N) is equal to one kilogram-metre per second squared (1kg⋅m⋅s−2).
The pascal (Pa) is equal to one newton per square metre (1N/m2).
The joule (J) is equal to one newton-metre (1N.m).
The watt (W) is equal to one joule per second (1J/s).
The coulomb (C) is equal to one ampere second (1A⋅s).
The volt (V) is equal to one joule per coulomb (1J/C).
The weber (Wb) is equal to one volt-second (1V⋅s).
The tesla (T) is equal to one weber per square metre (1Wb/m2).
The farad (F) is equal to one coulomb per volt (1C/V).
Official source
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