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Hand


A hand is a traditional unit of length primarily used to measure the height of horses. It is equal to 4 inches or 10.16 centimeters.


The origin of the hand as a measurement comes from using the width of a human hand, and it has been standardized at 4 inches for consistency in horse measurement. Horse height is expressed in "hands," measured from the ground to the highest point of the withers (the ridge between the shoulder blades).


Key points:



  • 1 hand = 4 inches



  • 1 hand = 10.16 centimeters



  • Used mainly for measuring horse height



  • Horse height is often given in hands and inches, e.g., 15.2 hands means 15 hands plus 2 inches



The hand remains the standard unit for horse height in many English-speaking countries.


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.




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