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International System Of Units
The INTERNATIONAL SYSTEM OF UNITS (abbreviated as SI, from the French _Système internationale (d'unités)_) is the modern form of the metric system , and is the most widely used system of measurement . It comprises a coherent system of units of measurement built on seven base units . The system also establishes a set of twenty prefixes to the unit names and unit symbols that may be used when specifying multiples and fractions of the units. The system was published in 1960 as a result of an initiative that began in 1948. It is based on the metre–kilogram–second system of units (MKS) rather than any variant of the centimetre–gram–second system (CGS). SI is intended to be an evolving system, so prefixes and units are created and unit definitions are modified through international agreement as the technology of measurement progresses and the precision of measurements improves
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SI (other)
SI, SI or SI may refer to: CONTENTS* 1 Arts and media * 1.1 Music * 1.2 Publications * 2 Organisations * 2.1 Education * 2.2 Government * 2.3 Computing * 2.4 Politics * 3 Places * 4 Science and technology * 4.1 Biology and medicine * 4.2 Computing and Internet * 4.3 Vehicles * 5 Titles and ranks * 6 Other uses * 7 See also ARTS AND MEDIA * Si (film) , original title of the 2010 South Korean film Poetry * Si, a self-replicating artifact in the computer game Ancient Domains of Mystery MUSIC * Si (musical note) , the seventh note in the traditional fixed do solfège *
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Outline Of The Metric System
The following outline is provided as an overview of and topical guide to the metric system: METRIC SYSTEM – various loosely related systems of measurement that trace their origin to the decimal system of measurement introduced in France during the French Revolution
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Metric System
The METRIC SYSTEM is an internationally agreed decimal system of measurement . It was originally based on the _mètre des Archives _ and the _kilogramme des Archives _ introduced by the French First Republic in 1799, but over the years the definitions of the metre and the kilogram have been refined, and the metric system has been extended to incorporate many more units. Although a number of variants of the metric system emerged in the late nineteenth and early twentieth centuries, the term is now often used as a synonym for "SI" or the " International System of Units "—the official system of measurement in almost every country in the world. The metric system has been officially sanctioned for use in the United States since 1866, but the U.S
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System Of Measurement
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 commerce . Systems of measurement in modern use include the metric system , the imperial system , and United States
United States
customary units
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Coherence (units Of Measurement)
A COHERENT DERIVED UNIT is defined as a derived unit that, for a given system of quantities and for a chosen set of base units , is a product of powers of base units with no other proportionality factor than one. The concept of coherence was developed in the mid-nineteenth century by, amongst others, Kelvin and James Clerk Maxwell and promoted by the British Association for the Advancement of Science . The concept was initially applied to the centimetre–gram–second (CGS) and the foot–pound–second systems (FPS) of units in 1873 and 1875 respectively. The International System of Units (1960) was designed around the system of coherence
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Units Of Measurement
A UNIT OF MEASUREMENT is a definite magnitude of a quantity , defined and adopted by convention or by law, that is used as a standard for measurement of the same quantity. Any other value of that quantity can be expressed as a simple multiple of the unit of measurement. For example, length is a physical quantity . The metre is a unit of length that represents a definite predetermined length. When we say 10 metres (or 10 m), we actually mean 10 times the definite predetermined length called "metre". The definition, agreement, and practical use of units of measurement have played a crucial role in human endeavour from early ages up to this day. Different systems of units used to be very common. Now there is a global standard, the International System of Units
International System of Units
(SI), the modern form of the metric system . In trade, WEIGHTS AND MEASURES is often a subject of governmental regulation, to ensure fairness and transparency
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SI Base Unit
The International System of Units
International System of Units
(SI) defines seven units of measure as a basic set from which all other SI units can be derived . The SI BASE UNITS and their physical quantities are the metre for measurement of length , the kilogram for mass , the second for time , the ampere for electric current , the kelvin for temperature , the candela for luminous intensity , and the mole for amount of substance . The SI base units form a set of mutually independent dimensions as required by dimensional analysis commonly employed in science and technology. The names and symbols of SI base units are written in lowercase, except the symbols of those named after a person, which are written with an initial capital letter
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Metric Prefix
A METRIC PREFIX is a unit prefix that precedes a basic unit of measure to indicate a multiple or fraction of the unit. While all metric prefixes in common use today are decadic , historically there have been a number of binary metric prefixes as well. Each prefix has a unique symbol that is prepended to the unit symbol. The prefix _kilo- _, for example, may be added to _gram_ to indicate _multiplication_ by one thousand: one kilogram is equal to one thousand grams. The prefix _milli- _, likewise, may be added to _metre_ to indicate _division_ by one thousand; one millimetre is equal to one thousandth of a metre. Decimal multiplicative prefixes have been a feature of all forms of the metric system , with six dating back to the system's introduction in the 1790s. Metric prefixes have even been prepended to non-metric units
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MKS System Of Units
The MKS SYSTEM OF UNITS is a physical system of units that expresses any given measurement using base units of the metre , kilogram , and/or second (MKS). Historically the use of the MKS system of units succeeded the centimetre–gram–second system of units (CGS) in commerce and engineering, (1889). The metre and kilogram system served as the basis for the development of the International System of Units , which now serves as the international standard. Because of this, the standards of the CGS system were gradually replaced with metric standards incorporated from the MKS system. The exact list of units used in the MKS system changed over time. It incorporated base units other than the metre, kilogram, and second in addition to derived units. An incomplete list of the base and derived units appears below
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Centimetre–gram–second System Of Units
The CENTIMETRE–GRAM–SECOND SYSTEM OF UNITS (abbreviated CGS or CGS) is a variant of the metric system based on the centimetre as the unit of length , the gram as the unit of mass , and the second as the unit of time . All CGS mechanical units are unambiguously derived from these three base units, but there are several different ways of extending the CGS system to cover electromagnetism . The CGS system has been largely supplanted by the MKS system based on the metre , kilogram , and second, which was in turn extended and replaced by the International System of Units
International System of Units
(SI). In many fields of science and engineering, SI is the only system of units in use but there remain certain subfields where CGS is prevalent
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General Conference On Weights And Measures
The GENERAL CONFERENCE ON WEIGHTS AND MEASURES (French : _Conférence générale des poids et mesures_ – CGPM) is the senior of the three Inter-governmental organizations established in 1875 under the terms of the Metre Convention (French : _Convention du Mètre_) to represent the interests of member states. The treaty, which also set up two further bodies, the International Committee for Weights and Measures (French : _Comité international des poids et mesures_ – CIPM) and the International Bureau of Weights and Measures (French : _Bureau international des poids et mesures_ – BIPM), was drawn up to coordinate international metrology and to coordinate the development of the metric system . The conference meets in Sèvres (south-west of Paris) every four to six years
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Kilogram
The KILOGRAM or KILOGRAMME ( SI unit symbol: KG) is the base unit of mass in the International System of Units (SI) (the Metric system ) and is defined as being equal to the mass of the _International Prototype of the Kilogram_ (IPK, also known as "Le Grand K" or "Big K"). The avoirdupois (or _international_) pound , used in both the imperial and US customary systems, is defined as exactly 6999453592370000000♠0.45359237 kg, making one kilogram approximately equal to 2.2046 avoirdupois pounds. Other traditional units of weight and mass around the world are also defined in terms of the kilogram, making the IPK the primary standard for virtually all units of mass on Earth
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Discipline (academia)
An ACADEMIC DISCIPLINE or ACADEMIC FIELD is a branch of knowledge . It incorporates expertise, people, projects, communities, challenges, studies, inquiry, and research areas that are strongly associated with a given scholastic subject area or college department. For example, the branches of science are commonly referred to as the scientific disciplines, e.g. physics , mathematics , and biology . Individuals associated with academic disciplines are commonly referred to as experts or specialists. Others, who may have studied liberal arts or systems theory rather than concentrating in a specific academic discipline, are classified as generalists
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Metre Convention
METRE CONVENTION (French: Convention du Mètre), also known as the TREATY OF THE METRE, is an international treaty that was signed in Paris on 20 May 1875 by representatives of 17 nations. (Argentina, Austria-Hungary, Belgium, Brazil, Denmark, France, Germany, Italy, Peru, Portugal, Russia, Spain, Sweden
Sweden
and Norway, Switzerland, Turkey, United States
United States
of America and Venezuela). The treaty set up an institute for the purpose of coordinating international metrology and for coordinating the development of the metric system . The treaty also set up associated organizations to oversee the running of the institute. Initially it was only concerned with the units of mass and length but, in 1921, at the 6th meeting of the General Conference on Weights and Measures (CGPM), it was revised and its mandate extended to cover all physical measurements
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