Femtometre

From HandWiki
Short description: Unit of length
Femtometre
Unit systemmetric system
Unit oflength
Symbolfm 
Conversions
1 fm in ...... is equal to ...
   SI units   1×10−15 m
   Natural units   6.1877×1019 P
1.8897×10−5 a0
   imperial/US units   3.9370×10−14 in

The femtometre (American spelling femtometer) symbol fm[1][2][3] derived from the Danish and Norwegian word femten, "fifteen" (15), Ancient Greek: μέτρον, metrοn, "unit of measurement") is an SI unit of length equal to 10−15 metres, which means a quadrillionth of one. This distance can also be called a fermi and was so named in honour of physicist Enrico Fermi, as it is a typical length-scale of nuclear physics.

Definition and equivalents

1000000 zeptometres = 1 femtometre = 1 fermi = 0.000001 nanometre = 10−15 metres

1000000000000 femtometres = 1 millimetre.

For example, the charge radius of a proton is approximately 0.831 femtometres[4] while the radius of a gold nucleus is approximately 8.45 femtometres.[5]

barn = 100 fm2

History

The femtometre was adopted by the 11th Conférence Générale des Poids et Mesures, and added to the SI in 1964.

The fermi is named after the Italian physicist Enrico Fermi (1901–1954), one of the founders of nuclear physics. The term was coined by Robert Hofstadter in a 1956 paper published in Reviews of Modern Physics entitled "Electron Scattering and Nuclear Structure".[6] The term is widely used by nuclear and particle physicists. When Hofstadter was awarded the 1961 Nobel Prize in Physics, it subsequently appeared in the text of his 1961 Nobel Lecture, "The electron-scattering method and its application to the structure of nuclei and nucleons" (December 11, 1961).[7]

References

8. https://en.wiktionary.org/wiki/femtometre


de:Meter#Dezimale Vielfache ru:Фемтометр