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Femtometre : ウィキペディア英語版
Femtometre

The femtometre (American spelling femtometer, symbol fm〔() 〕) (Danish: ', "fifteen"; Ancient Greek: , ', "unit of measurement") is an SI unit of length equal to 10−15 metres. This distance can also be called fermi and was so named in honour of physicist Enrico Fermi, as it is a typical length-scale of nuclear physics.
==Definition and equivalents==
1000 attometres = 1 femtometre = 1 fermi = 0.001 picometre = 1.0 × 10−15 metres
1,000,000 femtometres = 10 Ångström = 1 nanometre.
For example, the charge radius of a proton is approximately 0.84–0.87 femtometres while
the radius of a gold nucleus is approximately 8.45 femtometres.
1 barn = 100 fm2

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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