The SI base quantities form a set of mutually independent dimensions as required by dimensional analysis commonly employed in science and technology. However, in a given realization of these units they may well be interdependent, i.e. defined in terms of each other. Many other units, such as the liter , are formally not part of the SI, but are accepted for use with SI. __TOC__
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| - The SI base quantities form a set of mutually independent dimensions as required by dimensional analysis commonly employed in science and technology. However, in a given realization of these units they may well be interdependent, i.e. defined in terms of each other. Many other units, such as the liter , are formally not part of the SI, but are accepted for use with SI. __TOC__
- The SI system of units defines seven SI base units: physical units <a href="http://en.wikipedia.org/wiki/Physical_unitdefined">http://en.wikipedia.org/wiki/Physical_unitdefined</a> by an operational definition <a href="http://en.wikipedia.org/wiki/Operational_definition.">http://en.wikipedia.org/wiki/Operational_definition.</a> All other physical units can be derived from these base units: these are known as SI derived units. Derivation is by dimensional analysis. Use SI prefixes to abbreviate long numbers. SI base units
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| - The SI system of units defines seven SI base units: physical units <a href="http://en.wikipedia.org/wiki/Physical_unitdefined">http://en.wikipedia.org/wiki/Physical_unitdefined</a> by an operational definition <a href="http://en.wikipedia.org/wiki/Operational_definition.">http://en.wikipedia.org/wiki/Operational_definition.</a> All other physical units can be derived from these base units: these are known as SI derived units. Derivation is by dimensional analysis. Use SI prefixes to abbreviate long numbers. The following are the base units from which all others are derived. They are dimensionally independent, with the exception of the candela. The candela was formerly a fundamental unit but has been redefined in terms of the other SI base units. Despite this, it is still considered a base unit for historical reasons. SI base units
- The SI base quantities form a set of mutually independent dimensions as required by dimensional analysis commonly employed in science and technology. However, in a given realization of these units they may well be interdependent, i.e. defined in terms of each other. The names of SI units are written in lowercase characters (the 'degree Celsius' meets this rule, as 'degree' is the unit, and 'Celsius' is a modifier). The symbols of units are written in lowercase (e.g. meter has the symbol m), except that symbols for units named after persons are written with an initial capital letter (e.g., the hertz has the uppercase symbol Hz). Many other units, such as the liter , are formally not part of the SI, but are accepted for use with SI. __TOC__
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