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

Petameter

A petameter (Pm) is a unit of length in the metric system, equal to 1 quadrillion meters (1 petameter = 10¹⁵ meters). This unit is extremely large and is used mainly in astronomy and theoretical physics to describe vast distances, such as those between stars or galaxies. For example, one petameter is about 105.7 light years. Since it measures such enormous distances, the petameter is not used in everyday life or common scientific applications—it’s mostly used in discussions about the scale of the universe.

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.

• 
  

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

  
  
• 
  

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

  
  
• 
  

  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.

  
  
• 
  

  Used in scattering theory and classical electron models.

  
  

Key facts:

• 
  

  Classical electron radius ≈ 2.818 × 10⁻¹⁵ m

  
  
• 
  

  Represents an electromagnetic length scale, not a physical size

  
  
• 
  

  Important in classical models of electron behavior

  
  

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