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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:

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  1 fermi = 1 femtometer = 10⁻¹⁵ meters

  
  
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  Used to measure nuclear dimensions and particle sizes

  
  
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  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.

A statute mile is a unit of length commonly used in the United States and the United Kingdom. It is officially defined as 5,280 feet or 1,609.344 meters. The term "statute mile" distinguishes it from other types of miles, such as the nautical mile. The origin of the statute mile dates back to an Act of Parliament in England in 1593, which standardized the length of the mile. It is primarily used for measuring distances on land, such as in road signs, speed limits, and maps. While many countries have adopted the metric system, the statute mile remains in everyday use in a few countries. In contrast to the nautical mile, which is used for air and sea navigation, the statute mile is mainly applied in land-based contexts. It is also used to calculate speed in miles per hour (mph), especially for vehicles and road travel.