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In physics, natural units are physical units of measurement based only on universal physical constants. The origin of their definition comes only from properties of nature and not from any human construct.

A rack unit, U or RU is a unit of measure that describes the height of equipment designed to mount in a 19-inch rack or a 23-inch rack. The 19-inch (482.6 mm) or 23-inch (584.2 mm) dimension refers to the width of the equipment mounting frame in the rack including the frame; the width of the equipment that can be mounted inside the rack is less.

Some of these units are still in use even though metric system was formally established in 1923. Before the metrication the old units were standartied to exact metric values.

cuadra of Argentina / cuadra of Bolivia / cuadra of Chile / cuadra of Colombia / cuadra of Ecuador / cuadra of Nicaragua / cuadra of Paraguay / cuadra of Uruguay / vara of Argentina / vara of Brazil / vara of Chile / vara of Colombia / vara of Costa Rica / vara of Cuba / vara of Dominican Republic / vara of Ecuador / vara of El Salvador / vara of Guatemala / vara of Honduras / vara of Mexico / vara of Nicaragua / vara of Panama / vara of Paraguay / vara of Peru (peruana) / vara of Peru (española) / vara of Uruguay / vara of São Tomé and Principe / vara of Venezuela

Units: cuadra of Argentina / cuadra of Bolivia / cuadra of Chile / cuadra of Colombia / cuadra of Ecuador / cuadra of Nicaragua / cuadra of Paraguay / cuadra of Uruguay / vara of Argentina / vara of Brazil / vara of Chile / vara of Colombia / vara of Costa Rica / vara of Cuba / vara of Dominican Republic / vara of Ecuador / vara of El Salvador / vara of Guatemala / vara of Honduras / vara of Mexico / vara of Nicaragua / vara of Panama / vara of Paraguay / vara of Peru (peruana) / vara of Peru (española) / vara of Uruguay / vara of São Tomé and Principe / vara of Venezuela

These units are still actively used in some countries of Latin America. Their values vary from country to country. You can find more old Spanish customary units on our historical lengths page

These measures were abandoned in favor of the international nautical measures in 1970.

These measures were abandoned in favor of the international nautical measures in 1954.

The international nautical mile was defined by the First International Extraordinary Hydrographic Conference, Monaco in 1929. This is the only definition in widespread current use, and is the one accepted by the International Bureau of Weights and Measures. Before 1929 different countries had different definitions, and the Soviet Union, the United Kingdom and the United States did not immediately accept the international value.

The first English official measurement standards were defined in 15th century. British system of units, known as imperial units, was established in 1824. The British Weights and Meausurements Act of 1824 repealed all existing British measures legislation and redefined existing units. The 1963 Weights and Measures Act standartized the international measures.

From 1995 the UK adopted metric units for general use. The only imperial measures of length that can be officially used now are miles, yards, feet and inches for road traffic signs.

American weights and measures are based on units used in Britain prior to 1826, when imperial system was officially established. Until 1960-1963 American and British units of length were different in 2 parts per million. In the middle of 20th century it started causing problems and the governments of the two countries agreed to refine the measures to exactly match. Since then Great Britain and the United States were using the same measures of length. In the U.S. the old standard of foot was retained with the name US survey foot.

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This converter features contemporary units of length. There is also a special converter for historical units of length you might want to visit for ancient, medieval and other old units that are no longer used.

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Does convert-me.com really exist since 1996? In fact it's even older. We launched the first version of our online units converter in 1995. There was no JavaScript there and all conversions had to be done on server. The service was slow. A year later the technology allowed us to create an instant units conversion service that became the prototype of what you see now.

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