- the internationally agreed system of units now in use for all scientific purposes. Based on the metre-kilogram-second system, SI units have seven base units and two supplementary units. Measurements of all other physical quantities are expressed in derived units, consisting of two or more base units. Base SI units and Derived SI units are listed having special names; all these units are defined in the dictionary.Decimal multiples of SI units are expressed using specified prefixes; where possible a prefix representing 10 raised to a power that is a multiple of three should be used.
Medical dictionary. 2011.
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Units — es una aplicación informática para UNIX y derivados, utilizada para convertir unidades. En su versión 1.85 tiene soporte para 2.438 unidades, 71 prefijos y 32 unidades no lineales. Incluye algunas unidades de interés histórico y otras esotéricas; … Wikipedia Español
Units per al progrés — Président Jaume Ramond Fondé … Wikipédia en Français
Units of measurement — Weights and measures redirects here. For other uses, see Weights and measures (disambiguation). The former Weights and Measures office in Seven Sisters, London A unit of measurement is a definite magnitude of a physical quantity, defined and… … Wikipedia
Units conversion by factor-label — Many, if not most, parameters and measurements in the physical sciences and engineering are expressed as a numerical quantity and a corresponding dimensional unit; for example: 1000 kg/m³, 100 kPa/bar, 50 miles per hour, 1000 Btu/lb. Converting… … Wikipedia
Units of Measure Directive — The Units of Measure Directive, sometimes referred to as the Metric Directive and more formally known as Council Directive 80/181/EEC of 20 December 1979 on the approximation of the laws of the Member States relating to units of measurement and… … Wikipedia
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