Femto (English spelling) femto-
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SI prefix for 10 -15 (one quadrillionth) of a unit. The symbol f comes from the Danish word fen-ten (15). For example, 1fm = 10 -15 m. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
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単位の 10-15 倍 (1000兆分の1) を表わすSI接頭語。記号は f 。デンマーク語のフェンテン (15) に由来する。たとえば，1fm＝10-15m である。
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