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The astronomical system of units, formerly called the IAU (1976) System of Astronomical Constants, is a system of measurement developed for use in astronomy. It was adopted by the International Astronomical Union (IAU) in 1976 via Resolution No. 1, [1] and has been significantly updated in 1994 and 2009 (see Astronomical constant ).
The rmks system (rationalized metre–kilogram–second) combines MKS with rationalization of electromagnetic equations. The MKS system with the ampere as a fourth base unit, is sometimes referred to as the MKSA system. This system was extended by adding the kelvin and candela as base units in 1960, thus forming the International System of Units.
This system was at one time widely used by electrical engineers because the volt and ampere had been adopted as international standard units by the International Electrical Congress of 1881. As well as the volt and ampere, the farad (capacitance), ohm (resistance), coulomb (electric charge), and henry (inductance) are consequently also used in the practical system and are the same as the SI units.
SI Brochure: The International System of Units (SI) Note for translators and editors: Details on changes made since May 2019 are available on request to the BIPM Webmaster. Creative Commons Attribution 3.0 IGO License. The International System of Units. 9th edition (2019)
A litre is a cubic decimetre, which is the volume of a cube 10 centimetres × 10 centimetres × 10 centimetres (1 L ≡ 1 dm 3 ≡ 1000 cm 3 ). Hence 1 L ≡ 0.001 m 3 ≡ 1000 cm 3; and 1 m 3 (i.e. a cubic metre, which is the SI unit for volume) is exactly 1000 L. From 1901 to 1964, the litre was defined as the volume of one kilogram of pure ...
United States customary units (often incorrectly referred to as imperial units) [1] form a system of measurement units commonly used in the United States and most U.S. territories, [2] since being standardized and adopted in 1832. [3] The United States customary system developed from English units that were in use in the British Empire before ...
This list of international units is subsidiary to the list of units article and lists widely used modern units in a form of sortable table. The duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom. 299 792 458 second.
