Convert finger (cloth) to Electron radius (classical) Online | Free Length Converter

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:

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  1 finger ≈ ¾ inch (1.9 cm)

  
  
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  Based on the width of a human finger

  
  
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  Used in tailoring and cloth measurement

  
  
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  Mostly of historical interest today

Classical Electron Radius

The classical electron radius is a theoretical length scale associated with the electron, derived from classical electromagnetism. It represents the size of a hypothetical sphere where the electron’s electrostatic energy equals its rest mass energy.

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  Its value is approximately 2.818 × 10⁻¹⁵ meters (about 2.8 femtometers).

  
  
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  Calculated using fundamental constants: the electron charge, mass, and the speed of light.

  
  
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  It is not the actual physical size of the electron (which is considered point-like in quantum mechanics), but a useful scale in classical physics.

  
  
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  Used in scattering theory and classical electron models.

  
  

Key facts:

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  Classical electron radius ≈ 2.818 × 10⁻¹⁵ m

  
  
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  Represents an electromagnetic length scale, not a physical size

  
  
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  Important in classical models of electron behavior

  
  

This radius helps bridge classical and quantum views of particle physics.