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Peta is a decimal unit prefix in the metric system denoting multiplication by 1015 (). It was adopted as an SI prefix in the International System of Units in 1975,〔(【引用サイトリンク】title=Resolution 10 of the 15th meeting of the CGPM (1975) )〕 and has the symbol P. ''Peta'' is derived from the Greek , meaning "five". It denotes the fifth power of 1000 (10005). It is similar to the prefix ''penta'' ("five"), but without the letter ''n'' (on the analogy of the prefix ''tera'' (from the Greek for "monster") for 10004 looking like ''tetra-'' ("four") with a letter missing). Examples: *1 petametre = 1015 metres *1 petasecond = 1015 seconds (31,7 million years) *1 petabyte = 1015 bytes *the mass–energy equivalence is 89.9 PJ/kg *1 light-year = 9.461 Pm ==See also== * Metric prefix * Binary prefix 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「Peta-」の詳細全文を読む スポンサード リンク
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