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A vara (meaning "rod" or "pole", abbreviation: var) is an old Spanish unit of length. Varas are a surveying unit that appear in many deeds in the southern United States due to them previously being part of Mexico, they became part of the United States due to the Treaty of Guadalupe Hidalgo. Varas were also used in many parts of Latin America ...
The United States and the Metric System (LC 1136) nist.gov Archive.org; The Metric System in the United States Archived June 11, 2017, at the Wayback Machine; A Metric America: A Decision Whose Time Has Come on nist.gov Archive.org; Metric Conversion Act of 1975 on nist.gov Archive.org; www.us-metric.org—U.S. Metric Association (mirror link)
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 most common units in modern use are the metric units, used in every country globally. In the United States the U.S. customary units are also in use. British Imperial units are still used for some purposes in the United Kingdom and some other countries. The metric system is sub-divided into SI and non-SI units. [1] [2] [3]
Over time, the metric system has influenced the United States through international trade and standardisation. The use of the metric system was made legal as a system of measurement in 1866 [165] and the United States was a founding member of the International Bureau of Weights and Measures in 1875. [166]
The conversion between different SI units for one and the same physical quantity is always through a power of ten. This is why the SI (and metric systems more generally) are called decimal systems of measurement units. [10] The grouping formed by a prefix symbol attached to a unit symbol (e.g. ' km ', ' cm ') constitutes a new inseparable unit ...
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The Metric Conversion Act of 1975 is an Act of Congress that was signed into law by U.S. President Gerald Ford on December 23, 1975. [1] It declared the metric system "the preferred system of weights and measures for United States trade and commerce", but permitted the use of United States customary units in all activities.