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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.

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  1 pica = 1/6 inch ≈ 4.233 millimeters

  
  
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  1 pica = 12 points

  
  
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  Used primarily in graphic design, printing, and typesetting

  
  
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  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.

Ångström

An ångström (symbol: Å) is a unit of length commonly used in physics, chemistry, and biology to measure very small distances, such as atomic and molecular scales. It is equal to 10⁻¹⁰ meters, or 0.1 nanometers (nm).

The unit is named after the Swedish physicist Anders Jonas Ångström, who made significant contributions to spectroscopy.

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  1 ångström = 10⁻¹⁰ meters = 0.1 nanometers

  
  
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  Used to measure atomic and molecular sizes, wavelengths of light, and crystal lattice constants

  
  
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  Common in fields like crystallography, chemistry, and materials science

  
  

Though largely replaced by the nanometer in the SI system, the ångström remains widely used in scientific literature to describe very small lengths.