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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 Molar mass constant ： ウィキペディア英語版 Molar mass constant The molar mass constant, symbol ''M''u, is a physical constant which relates relative atomic mass and molar mass. Its value is defined to be 1 g/mol in SI units. The molar mass constant is important in writing dimensionally correct equations. It is common to see phrases such as :''The molar mass of an element is the atomic weight in grams per mole.'' However, atomic weight, i.e., relative atomic mass, is a dimensionless quantity, and cannot take the units of grams per mole. Formally, the operation is the multiplication by a constant which has the value 1 g/mol, that is the molar mass constant. The molar mass constant is unusual (but not unique) among physical constants by having an exactly defined value rather than being measured experimentally. It is fixed by the definitions of the mole and of relative atomic mass. From the definition of the mole, the molar mass of carbon 12 is exactly 12 g/mol. From the definition of relative atomic mass, the relative atomic mass of carbon 12, that is the atomic weight of a sample of pure carbon 12, is exactly 12. The molar mass constant is given by ::$M\_\; =\; =\; ^)\; =\; \backslash frac\}$ Hence the uncertainty in the value of the mass of a carbon-12 atom in SI units is governed by the uncertainty in the Avogadro constant: the CODATA 2006 recommended value is (''u''r = 5). The relatively simple value of the molar mass constant in SI units is also a consequence of the way in which the International System of Units is defined. It is possible to quote the value of the molar mass constant in other units: for example, it is equal to (1/453.592 37) lb/mol ~ 2.204 623 262 × 10−3 lb/mol. ==Future== According to the proposed new SI definitions, including a new definition of the mole through giving the Avogadro constant an exact numerical value, and assuming that the definition of an atomic mass unit (one twelfth of the rest mass of an unbound neutral atom of carbon-12 in its nuclear and electronic ground state) does not change, the molar mass constant, while still with great accuracy remaining equal to 1 g/mol, will no longer be exactly equal to that. 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「Molar mass constant」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.