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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.



Finger (Cloth)


A finger is a traditional, informal unit of length based on the width of a human finger. It was commonly used in tailoring and cloth measurement. The exact length varies but is generally considered to be about ¾ inch (approximately 1.9 centimeters).


The finger measurement helped tailors and fabric merchants make quick estimations of small lengths or widths of material before precise tools were common. It is one of several body-based units used historically in textiles, alongside the span, palm, and hand.


Though rarely used in modern measurement, the finger remains a part of historical measurement systems and illustrates how people relied on their bodies for everyday measuring tasks.


Summary:



  • 1 finger ≈ ¾ inch (1.9 cm)



  • Based on the width of a human finger



  • Used in tailoring and cloth measurement



  • Mostly of historical interest today



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