SI-units


By clicking the boxes you find SI units relevant to our calibration services
 

 

The International System of units SI consists of a set of base units, derived units and prefixes.

The seven base units of the seven base quantities in the SI are: New-SI.png


Base quantity ​
​         SI base unit ​ ​
Name               Symbol
length​metre​m
mass​kilogram​kg
​time​second​s
​electric current​ampere​A
​temperature​kelvin​K
​amount of substance​mole​mol
​luminous intensity​candela​cd

 

The derived units can be formed by combining the base units according to the algebraic relations linking the corresponding quantities, for instance the SI coherent derived unit for density (mass density) is kg/m3. For some of the derived units a special name and special symbol is given, for instance, the derived unit for force is Newton, N (kg·m·s–2).

The SI prefixes are used to form decimal multiples and submultiples of SI units:

Factor ​Name ​Symbol ​Factor ​Name ​Symbol
101​deca​da​10–1​deci​d
​102​hecto​k​10–2​centi​c
​103​kilo​k​10–3​milli​m
​106​mega​M​10–6​micro​µ
​109​giga​G​10–9​nano​n
​1012​tera​T​10–12​pico​p
​1015​peta​P​10–15femto​f
​1018​exa​E​10–18​atto​a
​1021​zetta​Z​10–21​zepto​z
​1024​yotta​Y​10–24​yocto​y

 

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