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Pico-
Pico- (symbol p) is a unit prefix in the metric system denoting one trillionth, a factor of 10−12 (). Derived from the Spanish ''pico'', meaning ''peak'', ''beak'', ''bit'',〔(【引用サイトリンク】title = pico- - definition of pico- by the Free Online Dictionary, Thesaurus and Encyclopedia. ) 〕 this was one of the original 12 prefixes defined in 1960 when the International System of Units was established.〔 〕 The radius of atoms range from ~25 picometers (hydrogen) - 260 picometers (caesium). One picolight-year is about nine kilometers (six miles). ==References==
simple:Pico-
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「Pico-」の詳細全文を読む
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