femtometre
Sign in to saveThe femtometre (American spelling femtometer), symbol fm, (derived from the Danish and Norwegian word 'fifteen', ) is a unit of length in the International System of Units (SI) equal to 10−15 metres, which means a quadrillionth of one metre. This distance is sometimes called a fermi and was so named in honour of Italian naturalized to American physicist Enrico Fermi, as it is a typical length-scale of nuclear physics.
AI overview
A femtometre is an extremely tiny unit of measurement equal to one quadrillionth of a metre, symbolized as fm. Scientists use it to measure distances in nuclear physics, where it represents the typical size scale of atomic nuclei, and it's named in honour of physicist Enrico Fermi.
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Key facts
- Unit.standard
- SI
- Unit.quantity
- length
- Unit.caption
- The helium atom and its nucleus in femtometres
- Unit.name
- femtometre
- Unit.image
- Helium atom QM DE.svg
- Unit.symbol
- fm
- Unit.units1
- SI base units
- Unit.units2
- Natural units
- Unit.inunits2
- a0
- Unit.units3
- imperial/US units
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Article
3 sectionsContents
- Definition and equivalents
- History
- References
The femtometre (American spelling femtometer), symbol fm, (derived from the Danish and Norwegian word 'fifteen', ) is a unit of length in the International System of Units (SI) equal to 10−15 metres, which means a quadrillionth of one metre. This distance is sometimes called a fermi and was so named in honour of Italian naturalized to American physicist Enrico Fermi, as it is a typical length-scale of nuclear physics.
== Definition and equivalents == zeptometres = 1 femtometre = 1 fermi = 0.000001 nanometre =