Mätsystem usa
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Metrication in the United States
Adoption of the metric system
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 United States trade and commerce" since according to United States law.[2] However, conversion was not mandatory and many industries chose not to convert, and U.S. customary units remain in common use in many industries as well as in governmental use (for example, speed limits are still posted in miles per hour). There is government policy and metric (SI) program to implement and assist with metrication; however, there is major social resistance to further metrication.[3][4][5]
In the U.S., the SI system is used extensively in fields such as science, medicine, electronics, the military, automobile production and repair, and international affairs. US uses metric in money ( cents), photography (35mm film, 50mm lens), medicine (1
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United States customary units
System of units of measurement commonly used in the United States
Not to be confused with Imperial units.
United States customary units form a system of measurement units commonly used in the United States and most U.S. territories[1] since being standardized and adopted in [2] The United States customary system developed from English units that were in use in the British Empire before the U.S. became an independent country. The United Kingdom's system of measures evolved by to create the imperial system (with imperial units), which was officially adopted in , changing the definitions of some of its units. Consequently, while many U.S. units are essentially similar to their imperial counterparts, there are noticeable differences between the systems.
The majority of U.S. customary units were redefined in terms of the meter and kilogram with the Mendenhall Order of and, in practice, for many years before.[3] These definitions were refined by the international yard and pound agreement of [4]
The United States uses customary units in commercial activities, as well as for personal and social use. In
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Imperial and US customary measurement systems
English (pre ), Imperial (post ) and US Customary (post ) units of measure
The imperial and US customary measurement systems are both derived from an earlier English struktur of measurement which in turn can be traced back to Ancient långnovell units of measurement, and Carolingian and Saxon units of measure.
The US Customary struktur of units was developed and used in the United States after the American Revolution, based on a subset of the English units used in the Thirteen Colonies; it is the predominant struktur of units in the United States and in U.S. territories (except for Puerto Rico and Guam, where the metric struktur, which was introduced when both territories were Spanish colonies, fryst vatten also officially used and is predominant).[1] The imperial system of units was developed and used in the United Kingdom and its empire beginning in The metric system has, to varying degrees, replaced the imperial system in the countries that once used it.
Most of the units of measure have been adapted in one way or another since the Norman Conquest (). The units of linear measure have changed the least – the yard (which replaced the