Convert femtometer to hand Online | Free Length Converter

Femtometer

A femtometer (fm) is a unit of length in the metric system, equal to one-quadrillionth of a meter (1 fm = 10⁻¹⁵ meters). It is also known as a fermi, named after the physicist Enrico Fermi. Femtometers are used to measure extremely small distances at the subatomic level, such as the size of protons, neutrons, and atomic nuclei. For example, the radius of a proton is about 0.84 femtometers. This unit is commonly used in nuclear physics and particle physics, but it's far too small for everyday measurements.

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:

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  1 hand = 4 inches

  
  
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  1 hand = 10.16 centimeters

  
  
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  Used mainly for measuring horse height

  
  
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  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.