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Conversion of units
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== Overview == The definition and choice of units in which to express a quantity may depend on the specific situation and the intended purpose. This may be governed by regulation, [[contract]], [[technical specifications]] or other published [[technical standard|standard]]s. Engineering judgment may include such factors as: * the [[precision and accuracy]] of measurement and the associated [[uncertainty of measurement]] * the statistical [[confidence interval]] or [[tolerance interval]] of the initial measurement * the number of [[significant figures]] of the measurement * the intended use of the measurement, including the [[engineering tolerance]]s * historical definitions of the units and their derivatives used in old measurements; e.g., [[international foot]] vs. US [[Foot (unit)#Survey foot|survey foot]]. For some purposes, conversions from one system of units to another are needed to be exact, without increasing or decreasing the precision of the expressed quantity. An ''adaptive conversion'' may not produce an exactly equivalent expression. [[Real versus nominal value|Nominal values]] are sometimes allowed and used.
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