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Pica


A pica is a unit of length commonly used in typography and printing to measure font sizes, line lengths, and spacing. It is equal to 1/6 of an inch, or exactly 12 points in the point system.


Key facts:



  • 1 pica = 1/6 inch ≈ 4.233 millimeters



  • 1 pica = 12 points



  • Used primarily in graphic design, printing, and typesetting



  • Helps standardize the measurement of fonts, columns, and layouts



The pica remains a fundamental unit in desktop publishing and print design, helping maintain consistency in text and page formatting.



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.



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