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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.

Micron

A micron is another name for a micrometer, a very small unit of length in the metric system. One micron equals one-millionth of a meter (1 micron = 1 µm = 0.000001 meters). Microns are used to measure extremely small things like bacteria, cells, dust particles, or the thickness of hair and fibers. For example, a human hair is about 70 microns thick. The symbol for micron is "µm". Though “micron” is an older term, it is still commonly used in fields like biology, electronics, and materials science to describe microscopic measurements.