The International System of Units
n. SI, international metric system, metric system of units of measurement used for scientific work | ||||
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International System of Units Definition from Language, Idioms & Slang Dictionaries & Glossaries
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International System of Units
Noun
1. a complete metric system of units of measurement for scientists; fundamental quantities are length (meter) and mass (kilogram) and time (second) and electric current (ampere) and temperature (kelvin) and amount of matter (mole) and luminous intensity (candela); "Today the United States is the only country in the world not totally committed to the Systeme International d'Unites"
(synonym) Systeme International d'Unites, Systeme International, SI system, SI, International System
(hypernym) metric system
Noun
1. a complete metric system of units of measurement for scientists; fundamental quantities are length (meter) and mass (kilogram) and time (second) and electric current (ampere) and temperature (kelvin) and amount of matter (mole) and luminous intensity (candela); "Today the United States is the only country in the world not totally committed to the Systeme International d'Unites"
(synonym) Systeme International d'Unites, Systeme International, SI system, SI, International System
(hypernym) metric system
International System of Units Definition from Science & Technology Dictionaries & Glossaries
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International System of Units (SI)
The modern form of the metric system , which has been adopted by the United States and most other nations. Note: The SI is constructed from seven base units for independent physical quantities. Tables showing these values are included below and are current as of Fall 1995.
SI Prefixes. The common metric prefixes are; Multiplacation Factor Prefix Name Prefix Symbol 1 000 000 000 000 = 1012 tera T 1 000 000 000 = 109 giga G 1 000 000 = 106 mega M 1 000 = 103 kilo k 100 = 102 hecto h 10 = 101 deka da 0.1 = 10-1 deci d 0.01 = 10-2 centi c 0.001 = 10-3 milli m 0.000 001 = 10-6 micro
0.000 000 001 = 10-9 nano n 0.000 000 000 001 = 10-12 pico p
SI Base Units Quantity Unit Name Unit Symbol length meter m mass kilogram kg time second s electric current ampere A thermodynamic temperature kelvin K amount of substance mole mol luminous intensity candela cd
SI derived units. Derived units are formed by combining base units and other derived units according to the algebraic relations linking the corresponding quantities. The symbols for derived units are obtained by means of the mathematical signs for multiplication, division, and use of exponents. For example, the SI unit for velocity is the meter per second (m/s or m•s-1), and that for angular velocity is the radian per second (rad /s or rad•s-1). Some derived SI units have been given special names and symbols, as listed in this table. Quantity Unit Name Unit Symbol Expression in Terms of Other SI Units Absorbed dose, specific energy imparted, kerma, absorbed dose index gray Gy J/kg Activity (of a radionuclide) becquerelBq1/s Celsius temperaturedegree Celsius
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The modern form of the metric system , which has been adopted by the United States and most other nations. Note: The SI is constructed from seven base units for independent physical quantities. Tables showing these values are included below and are current as of Fall 1995.
SI Prefixes. The common metric prefixes are; Multiplacation Factor Prefix Name Prefix Symbol 1 000 000 000 000 = 1012 tera T 1 000 000 000 = 109 giga G 1 000 000 = 106 mega M 1 000 = 103 kilo k 100 = 102 hecto h 10 = 101 deka da 0.1 = 10-1 deci d 0.01 = 10-2 centi c 0.001 = 10-3 milli m 0.000 001 = 10-6 micro
SI Base Units Quantity Unit Name Unit Symbol length meter m mass kilogram kg time second s electric current ampere A thermodynamic temperature kelvin K amount of substance mole mol luminous intensity candela cd
SI derived units. Derived units are formed by combining base units and other derived units according to the algebraic relations linking the corresponding quantities. The symbols for derived units are obtained by means of the mathematical signs for multiplication, division, and use of exponents. For example, the SI unit for velocity is the meter per second (m/s or m•s-1), and that for angular velocity is the radian per second (rad /s or rad•s-1). Some derived SI units have been given special names and symbols, as listed in this table. Quantity Unit Name Unit Symbol Expression in Terms of Other SI Units Absorbed dose, specific energy imparted, kerma, absorbed dose index gray Gy J/kg Activity (of a radionuclide) becquerelBq1/s Celsius temperaturedegree Celsius
International System of Units Definition from Encyclopedia Dictionaries & Glossaries
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International System of Units
The International System of Units (abbreviated SI from the French ) is the modern form of the metric system. It is the world's most widely used system of units, both in everyday commerce and in science.
The older metric system included several groups of units. The SI was developed in 1960 from the old metre-kilogram-second (mks) system, rather than the centimetre-gram-second (cgs) system, which, in turn, had a few variants.
The SI introduced several newly named units. The SI is not static — units are created and definitions are modified through international agreement among many nations as the technology of measurement progresses.
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