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The International System of Units, or SI, [1]: 123 is a decimal and metric system of units established in 1960 and periodically updated since then. The SI has an official status in most countries, including the United States , Canada , and the United Kingdom , although these three countries are among the handful of nations that, to various ...
Conversion of units is the conversion of the unit of measurement in which a quantity is expressed, typically through a multiplicative conversion factor that changes the unit without changing the quantity. This is also often loosely taken to include replacement of a quantity with a corresponding quantity that describes the same physical property.
The International System of Units is the modern metric system. It is based on the metre–kilogram–second–ampere (MKSA) system of units from early in the 20th century. [20] It also includes numerous coherent derived units for common quantities like power (watt) and irradience (lumen).
It established a US Metric Board whose functions as of 1 October 1982 were transferred to the Dept of Commerce, Office of Metric Programs, to coordinate the voluntary conversion to the metric system. [92] In January 2007 NASA decided to use metric units for all future Moon missions, in line with the practice of other space agencies. [93]
Metrication is the process of introducing the International System of Units, also known as SI units or the metric system, to replace a jurisdiction's traditional measuring units. U.S. customary units have been defined in terms of metric units since the 19th century, [ 1 ] and the SI has been the "preferred system of weights and measures for ...
Gravitational metric system was a little-used variant of the metric system that normalised the acceleration due to gravity. Metre–tonne–second system of units was a variant of the metric system used in French and Russian industry between the First and Second World Wars. Between 1812 and 1839 France used a quasi-metric system: Mesures usuelles
system unit unit-code symbol or abbrev. notes sample default conversion combination output units the system(s) to which the unit belongs units listed by name unit-code to use in template symbols shown in output other notes about the units sample of the default conversion for the unit output codes for multiple conversions
The precision is 1 (1 decimal place), and units are abbreviated and linked. {{convert|895|hPa|psi inHg atm mbar|1|abbr=on|lk=on}} → 895 hPa (13.0 psi ; 26.4 inHg ; 0.9 atm ; 895.0 mbar ) It is preferable to use "+" to separate output units when the first unit uses engineering notation; that avoids looking up the unit in Module:Convert/extra .