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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Mass fraction (chemistry) ： ウィキペディア英語版 Mass fraction (chemistry) In chemistry, the mass fraction $w\_i$ is the ratio of one substance with mass $m\_i$ to the mass of the total mixture $m\_$, defined as :$w\_i\; =\; \backslash frac\; ^\; m\_i\; =\; m\_\; ;\; \backslash sum\_^\; w\_i\; =\; 1$ Mass fraction can also be expressed, with a denominator of 100, as percentage by mass (frequently, though erroneously, called ''percentage by weight'', abbreviated ''wt%''). It is one way of expressing the composition of a mixture in a dimensionless size; mole fraction (percentage by moles, mol%) and volume fraction (percentage by volume, vol%) are others. For elemental analysis, mass fraction (or "mass percent composition") can also refer to the ratio of the mass of one element to the total mass of a compound. It can be calculated for any compound using its empirical formula〔(Formula from Mass Composition )〕 or its chemical formula〔()〕 ==Terminology== "Percent concentration" does not refer to this quantity. This improper name persists, especially in elementary textbooks. In biology, the unit "%" is sometimes (incorrectly) used to denote mass concentration, also called "mass/volume percentage." A solution with 1 g of solute dissolved in a final volume of 100 mL of solution would be labeled as "1 %" or "1 % m/v" (mass/volume). This is incorrect because the unit "%" can only be used for dimensionless quantities. Instead, the concentration should simply be given in units of g/mL. "Percent solution" or "percentage solution" are thus terms best reserved for "mass percent solutions" (m/m = m% = mass solute/mass total solution after mixing), or "volume percent solutions" (v/v = v% = volume solute per volume of total solution after mixing). The very ambiguous terms "percent solution" and "percentage solutions" with no other qualifiers continue to occasionally be encountered. In thermal engineering vapor quality is used for the mass fraction of vapor in the steam. In alloys, especially those of noble metals, the term fineness is used for the mass fraction of the noble metal in the alloy. 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「Mass fraction (chemistry)」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.