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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.


Key facts:



  • 1 ångström = 10⁻¹⁰ meters = 0.1 nanometers



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



  • 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.



Span (Cloth)


A span is an old unit of length based on the distance between the tip of the thumb and the tip of the little finger of a fully extended hand. Traditionally, it measures about 9 inches or 22.86 centimeters.


In the context of cloth and textiles, the span was used as a convenient, informal measure to estimate small lengths of fabric before standardized rulers became widespread. It was helpful for tailors and traders to quickly gauge lengths during measuring and cutting.


While the span is largely obsolete as a formal unit today, it reflects historical measurement practices tied closely to the human body, similar to the cubit or hand.


Summary:



  • 1 span ≈ 9 inches (22.86 cm)



  • Based on the hand’s spread



  • Used historically in cloth measurement and tailoring



  • Now mostly of historical and cultural interest



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