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femtometre

File:Helium_atom_QM_DE.svg · Wikimedia Commons · See Wikimedia Commons

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femtometre

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Also known as fermi, fm, femtometres

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.

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.

AI-generated from the Wikipedia summary — may contain errors.

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

via Wikipedia infobox

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Encyclopedic overview

3 sections
Contents
  • 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 =

Excerpted from Wikipedia’s “femtometre” article, available under the CC BY-SA 4.0 licence.

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