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History of measurement The French Revolution gave rise to the metric systemand this has spread around the world, replacing most customary units of measure.
In most systems, length distancemassand time are base quantities. Later science developments showed that either electric charge or electric current could be added to extend the set of base quantities by which many other metrological units could be easily defined.
However, electrical units are not necessary for such a set. Gaussian unitsfor example, have only length, mass, and time as base quantities, and the ampere is defined in terms of other units. Other quantities, such as power and speedare derived from the base set: Historically a wide range of units was used for the same type of quantity: Such arrangements were satisfactory in their own contexts.
The preference for a more universal and consistent system based on more rational base units only gradually spread with the growth of science. Changing a measurement system has substantial financial and cultural costs which must be offset against the advantages to be obtained from using a more rational system.
However pressure built up, including from scientists and engineers for conversion to a more rational, and also internationally consistent, basis of measurement.
In antiquity, systems of measurement were defined locally: The unifying characteristic is that there was some definition based on some standard.
Eventually cubits and strides gave way to "customary units" to meet the needs of merchants and scientists. In the metric system and other recent systems, a single basic unit is used for each base quantity.
Often secondary units multiples and submultiples are derived from the basic units by multiplying by powers of ten, i. Thus the basic metric unit of length is the metre ; a distance of 1.
Metrication Metrication is complete or nearly complete in almost all countries. US customary units are heavily used in the United States and to some degree in Liberia. Traditional Burmese units of measurement are used in Burma.
A number of other jurisdictions have laws mandating or permitting other systems of measurement in some or all contexts, such as the United Kingdom — whose road signage legislationfor instance, only allows distance signs displaying imperial units miles or yards  — or Hong Kong.
At retail stores, the liter is a commonly used unit for volume, especially on bottles of beverages, and milligrams, rather than grains, are used for medications. Some other standard non- SI units are still in international use, such as nautical miles and knots in aviation and shipping.
Metric systems of units have evolved since the adoption of the first well-defined system in France in During this evolution the use of these systems has spread throughout the world, first to non-English-speaking countries, and then to English speaking countries.
Multiples and submultiples of metric units are related by powers of ten and their names are formed with prefixes. This relationship is compatible with the decimal system of numbers and it contributes greatly to the convenience of metric units.
In the early metric system there were two base units, the metre for length and the gram for mass. The other units of length and mass, and all units of area, volume, and derived units such as density were derived from these two base units.
Mesures usuelles French for customary measurements were a system of measurement introduced as a compromise between the metric system and traditional measurements. It was used in France from to FAR -- Part 12 Acquisition of Commercial Items (FAC ) (13 Jan ) (FAC ) (26 Oct ) -- Scope of Part.
This part prescribes policies and procedures unique to the acquisition of commercial items. A system of measurement is a collection of units of measurement and rules relating them to each other.
Systems of measurement have historically been important, regulated and defined for the purposes of science and heartoftexashop.coms of measurement in modern use include the metric system, the imperial system, and United States customary units. Measuring With Maggie An Introduction to US Standard Units Also known as "English Units" or "US Customary Units" Wow, I just flew in from planet Micron.
United States, officially United States of America, abbreviated U.S. or U.S.A., byname America, country in North America, a federal republic of 50 states. Besides the 48 conterminous states that occupy the middle latitudes of the continent, the United States includes the state of Alaska, at the northwestern extreme of North America, and the island state of Hawaii, in the mid-Pacific Ocean.
The United States still, for most purposes, uses the traditional, non-metric units which swere mainly inherited from England. Over the course of time, changes have been made on both sides of the Atlantic so that the British Imperial units came to differ, in some cases, from similarly-named.
U.S customary units is the system of units of measurement used to measure things in the United States. The system of Imperial units is similar and in some parts identical. Length or distance units include the inch, foot, yard and mile.