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Fermi


A fermi is a unit of length used in nuclear physics to measure extremely small distances, such as the size of atomic nuclei. It is equal to 1 femtometer (fm), which is 10⁻¹⁵ meters.


The unit is named after the Italian physicist Enrico Fermi, known for his work in nuclear physics.


Key facts:



  • 1 fermi = 1 femtometer = 10⁻¹⁵ meters



  • Used to measure nuclear dimensions and particle sizes



  • Essential in the study of nuclear and particle physics



The fermi is vital for describing distances at the subatomic scale, much smaller than atoms and molecules.


Famn


A famn (also spelled fathom in English) is a traditional Scandinavian unit of length used primarily for measuring the depth of water or length of ropes and cables. It is roughly equivalent to 6 Swedish feet, which translates to about 1.828 meters (approximately 6 feet).


The famn is similar in concept to the English fathom, based on the span of outstretched arms.


While largely obsolete today, the famn was commonly used in maritime contexts in Norway, Sweden, and Denmark and remains part of historical measurements.


Summary:



  • 1 famn ≈ 1.828 meters (6 feet)



  • Used to measure water depth and rope length



  • Traditional Scandinavian maritime unit



  • Equivalent to the English fathom





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