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billionth One billionth is the reciprocal of a billion, which means it has one of two definitions depending on whether the ''long scale'' or ''short scale'' definition is being used.〔.〕 ==Short scale==
In the short (or American) scale, a billionth is equal to 0.000 000 001, or 1 x 10−9 in scientific notation. The prefix for this number is nano, and is abbreviated as "n" (for example, in electronics, one nanofarad would be written as 1 nF).〔.〕
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「billionth」の詳細全文を読む
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