The following outline is provided as an overview of and topical guide to the metric system:
The metric system can be described as all of the following:
Discussions of the underlying philosophy of the metric system (and other systems of measure) include:
Articles that exist for many units of measure that are related to various flavours of the metric system are catalogued below. The codes in the various columns have the following meanings:
|Name||Quantity||SI unit||cgs unit||Other metric||Non-metric|
|Ampere-meter||magnetic pole strength||D|
|Dalton (Atomic mass unit)||Mass||E|
|Candela per square metre||Luminance||D|
|Cubic metre per second||Volumetric flow rate||D||D|
|Degree of arc||Angle||E|
|Gauss||Magnetic flux density||C|
|Gray||Absorbed [radiation] dose||C|
|Joule per mole||Energy per Amount of substance||D|
|Kilogram per cubic metre||Density||D||D|
|Kilometres per hour||Velocity||X|
|Lumen second||Luminous energy||D|
|Lux second||luminous exposure||D|
|Metre per second squared||Acceleration||D||D|
|Metre squared per second||Angular momentum||D||D|
|Minute of arc||Angle||E|
|Mole||Amount of substance||A|
|Neper||logarithmic unit for ratios||E|
|Newton-second||Impulse (physics) / Momentum||D|
|Oersted||Magnetic field strength||C|
|Radian per second||Angular frequency||D|
|Roentgen (unit)||kerma of X-rays and gamma rays||D|
|Roentgen equivalent man||Radiation dose equivalent||D|
|Sievert||Radiation dose equivalent||C|
|Tesla||Magnetic field strength||C|
History of the metric system – the metric system developed from a decimal system of measurement adopted by France after the French Revolution.
Principal dates in the development of the metric system include:
History of metrication – metrication is the process by which legacy, national-specific systems of measurement were replaced by the metric system.
Four variants of the metric system that predate the introduction of SI (1960) are described in varying levels of detail:
Between 1812 and 1839 France used a quasi-metric system:
Prior to 1875 the metric system was controlled by the French Government. In that year, seventeen nations signed the Metre Convention and the management and administration of the system passed into international control.
Both the European Union and the International Organization for Standardization have issued directives/recommendations to harmonise the use of units of measure. These documents endorse the use of SI for most purposes.
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