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Kansainvälinen yksikköjärjestelmä eli SI-järjestelmä (ransk. Système international d’unités) on maailman yleisin mittayksikköjärjestelmä. SI-järjestelmä sai nykyisen nimensä vuonna 1960, mutta keskeisimmiltä osiltaan se perustuu Ranskassa jo 1700-luvun lopulla käyttöön otettuun metrijärjestelmään.
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SI-perusyksiköt – Wikipedia. SI-yksiköiden keskinäiset...
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Si – Wikipedia. Si tarkoittaa seuraavia: kansainvälinen...
- SI-perusyksiköt
The International System of Units, internationally known by the abbreviation SI (from French Système international d'unités), is the modern form of the metric system and the world's most widely used system of measurement.
The International System of Units is a system of measurement based on 7 base units: the metre (length), kilogram (mass), second (time), ampere (electric current), kelvin (temperature), mole (quantity), and candela (brightness). These base units can be used in combination with each other.
Unit NameUnit SymbolDimension SymbolQuantity NamesTmLkgMAIThe SI base units are the standard units of measurement defined by the International System of Units (SI) for the seven base quantities of what is now known as the International System of Quantities: they are notably a basic set from which all other SI units can be derived.
Silicon is a chemical element; it has symbol Si and atomic number 14. It is a hard, brittle crystalline solid with a blue-grey metallic luster, and is a tetravalent metalloid and semiconductor. It is a member of group 14 in the periodic table: carbon is above it; and germanium, tin, lead, and flerovium are below it. It is relatively unreactive.