Definitions, Translations, and Word of the Day
Definition of "femtometre" []
- 10-15 of a metre. Symbol: fm (noun)
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Use "femtometre" in a sentence
- "The proton and the neutron have a diameter of 10-15m (a femtometre or a millionth of a millionth of a millimetre) and the electron is at least 1,000 times smaller."
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