SI derived units are units of measurement derived from the
seven SI base units specified by the International System of Units (SI). They can be expressed as a product (or ratio) of one or more of the base units, possibly scaled by an appropriate power of exponentiation (see: Buckingham π theorem). Some are dimensionless, as when the units cancel out in ratios of like quantities.
SI coherent derived units involve only a trivial proportionality factor, not requiring conversion factors.
The SI has special names for 22 of these coherent derived units (for example, hertz, the SI unit of measurement of frequency), but the rest merely reflect their derivation: for example, the square metre (m2), the SI derived unit of area; and the kilogram per cubic metre (kg/m3 or kg⋅m−3), the SI derived unit of density.
The names of SI coherent derived units, when written in full, are always in lowercase. However, the symbols for units named after persons are written with an uppercase initial letter. For example, the symbol for hertz is "Hz", while the symbol for metre is "m".[1]
^Suplee, Curt (2 July 2009). "Special Publication 811". Nist.
SIderivedunits are units of measurement derived from the seven SI base units specified by the International System of Units (SI). They can be expressed...
which has the SIunit m/s2.: 139 A combination of base and derivedunits may be used to express a derivedunit. For example, the SIunit of force is the...
designated, a derivedunit is unit for a derived quantity, involving the combination of quantities with different units; several SIderivedunits are specially...
Quantities: they are notably a basic set from which all other SIunits can be derived. The units and their physical quantities are the second for time, the...
to the radius. The unit was formerly an SI supplementary unit and is currently a dimensionless SIderivedunit, defined in the SI as 1 rad = 1 and expressed...
was formerly an SI supplementary unit, but this category was abolished in 1995 and the steradian is now considered an SIderivedunit. A steradian can...
the unit of electrical resistance in the International System of Units (SI). It is named after German physicist Georg Ohm. Various empirically derived standard...
science and in commerce. Two of the base SIunits and 17 of the derivedunits are named after scientists. 28 non-SIunits are named after scientists. By this...
In 2019, four of the seven SI base units specified in the International System of Quantities were redefined in terms of natural physical constants, rather...
becquerel (/ˌbɛkəˈrɛl/; symbol: Bq) is the unit of radioactivity in the International System of Units (SI). One becquerel is defined as an activity of...
(symbol: cd/m2) is the unit of luminance in the International System of Units (SI). The unit is based on the candela, the SIunit of luminous intensity...
physicist James Prescott Joule (1818–1889). In terms of SI base units and in terms of SIderivedunits with special names, the joule is defined as One joule...
quantified numerically using SIderivedunits (such as the cubic metre and litre) or by various imperial or US customary units (such as the gallon, quart...
squared is the unit of acceleration in the International System of Units (SI). As a derivedunit, it is composed from the SI base units of length, the...
The coulomb (symbol: C) is the unit of electric charge in the International System of Units (SI). It is equal to the electric charge delivered by a 1 ampere...
thickness) of a two-dimensional object is calculated as the mass per unit area. The SIderivedunit is the kilogram per square metre (kg·m−2). A related area number...
clean energy company, formerly Tesla Motors, Inc. Tesla (unit) (symbol: T), the SI-derivedunit of magnetic flux density Tesla may also refer to: Tesla...
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