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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 Nine (purity) ： ウィキペディア英語版 Nine (purity) Nines are an informal, yet common method of grading the purity of very fine precious metals such as platinum, gold and silver. Based on the system of millesimal fineness, a metal is said to be ''one nine'' or ''one nine fine'' if it is 900 fine, or 90% pure. A metal that is 990 fine is then described as ''two nines fine'' and one that is 999 fine is described as ''three nines fine''. Thus, nines are a logarithmic scale of purity for very fine precious metals. The nines scale is also sometimes used in describing the purity of bottled gases. Nines are used in a similar manner to describe computer system availability. ==See also== * Parts-per notation * 0.999... 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「Nine (purity)」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.