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SI units
the units of measurement generally accepted for all scientific and technical uses; together they make up the International
System of Units (see also metric system). The abbreviation SI, from the French Système International d'Unités, is used in all languages. There are seven base SI units, defined by specified physical measurements: the kilogram, meter, second, kelvin, ampere, mole, and candela. Units are derived for other physical quantities by multiplication and division of these units. Some common prefixes include
mega- (106, one million); kilo- (103, one thousand); hecto- (102, one hundred; deci- (one tenth), centi- (10−2, one hundredth); milli- (10−3, one thousandth); micro- (10−6, one millionth); nano- (10−9, one billionth); pico- (10−12, one trillionth); femto (10−15, one quadrillionth); and others.
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