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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 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.
SI: Physics: Relational: joule: J: energy, work, heat: kg⋅m 2 ⋅s −2: N⋅m = Pa⋅m 3: SI: Physics: Relational: watt: W: power, radiant flux: kg⋅m 2 ⋅s −3: J/s SI: Physics: Relational: coulomb: C: electric charge: s⋅A: SI: Physics: Relational: volt: V: electrical potential difference , emf: kg⋅m 2 ⋅s −3 ⋅A −1: W/A = J/C ...
The SI prefixes are metric prefixes that were standardised for use in the International System of Units (SI) by the International Bureau of Weights and Measures (BIPM) in resolutions dating from 1960 to 2022. [1] [2] Since 2009, they have formed part of the ISO/IEC 80000 standard.
The early metric systems defined a unit of weight as a base unit, while the SI defines an analogous unit of mass. In everyday use, these are mostly interchangeable, but in scientific contexts the difference matters. Mass, strictly the inertial mass, represents a quantity of matter.
This is a list of units that are not defined as part of the International System of Units but are otherwise mentioned in the SI Brochure, listed as being accepted for use alongside SI-units, or for explanatory purposes.
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 ...
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Trigonometric integral. Plot of the hyperbolic sine integral function Shi (z) in the complex plane from -2-2i to 2+2i with colors created with Mathematica 13.1 function ComplexPlot3D. Si ( x) (blue) and Ci ( x) (green) plotted on the same plot. Integral sine in the complex plane, plotted with a variant of domain coloring.
Pages in category "SI base quantities". The following 9 pages are in this category, out of 9 total. This list may not reflect recent changes . SI base quantity.