翻訳と辞書 Words near each other ・ Quantum error correction ・ Quantum ESPRESSO ・ Quantum evolution ・ Quantum excitation (accelerator physics) ・ Quantum feedback ・ Quantum fiction ・ Quantitative risk assessment software ・ Quantitative structure–activity relationship ・ Quantitative susceptibility mapping ・ Quantitative trait locus ・ Quantitative value investing ・ Quantities of information ・ Quantities, Units and Symbols in Physical Chemistry ・ Quantity ・ Quantity adjustment ・ Quantity calculus ・ Quantity Is Job 1 ・ Quantity of Books v. Kansas ・ Quantity surveyor ・ Quantity take-off ・ Quantity theory of money ・ Quantization ・ Quantization (image processing) ・ Quantization (linguistics) ・ Quantization (music) ・ Quantization (physics) ・ Quantization (signal processing) ・ Quantization commutes with reduction ・ Quantization of the electromagnetic field ・ Quantized state systems method Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Quantity calculus ： ウィキペディア英語版 Quantity calculus Quantity calculus is the formal method for describing the mathematical relations between ''abstract'' physical quantities. (Here the term ''calculus'' should be understood in its broader sense of "a system of computation," rather than in the sense of differential calculus and integral calculus.) Its roots can be traced to Fourier's concept of dimensional analysis (1822). The basic axiom of quantity calculus is Maxwell's description of a physical quantity as the product of a "numerical value" and a "reference quantity" (i.e. a "unit quantity" or a "unit of measurement"). De Boer summarized the multiplication, division, addition, association and commutation rules of quantity calculus and proposed that a full axiomatization has yet to be completed.〔 Measurements are expressed as products of a numeric value with a unit symbol, e.g. "12.7 m". Unlike algebra, the unit symbol represents a measurable quantity such as a meter, not an algebraic variable. A careful distinction needs to be made between abstract quantities and measurable quantities. The multiplication and division rules of quantity calculus are applied to SI base units (which are measurable quantities) to define SI derived units, including dimensionless derived units, such as the radian (rad) and steradian (sr) which are useful for clarity, although they are both algebraically equal to 1. Thus there is some disagreement about whether it is meaningful to multiply or divide units. Emerson suggests that if the units of a quantity are algebraically simplified, they then are no longer units of that quantity. Johansson proposes that there are logical flaws in the application of quantity calculus, and that the so-called dimensionless quantities should be understood as "unitless quantities". How to use quantity calculus for unit conversion and keeping tack of units in algebraic manipulations is explained in the handbook on Quantities, Units and Symbols in Physical Chemistry. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Quantity calculus」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.