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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 troy ounce ： ウィキペディア英語版 troy ounce The troy ounce (oz t) is a unit of imperial measure, now commonly only used for the mass (weight, in common parlance) of precious metals.〔("Status Report of U.S. Government Gold Reserve" ), Bureau of the Fiscal Service〕 One troy ounce is now defined as exactly 31.1034768 g. The troy ounce is about 10% heavier (ratio 192/175) than the avoirdupois ounce which equals 28.349523125 g. ==Etymology== The name "troy" is first attested in 1390. Though it is often connected to a fair at the city of Troyes, France,〔Oxford English Dictionary, Second edition, 1989; online version September 2011〕 this story may have been invented in the 18th century.〔 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「troy ounce」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.