Classical electron radius
Try it yourself:
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classicalElectronRadius
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The classicalElectronRadius is a derived electromagnetic length scale for the electron. It is not the electron’s measured physical size.
It appears in scattering and classical electromagnetic formulas. Relate it to elementaryCharge, electronMass, and electricConstant. Do not treat this classical parameter as a literal radius.
Enter classicalElectronRadius on a calculator line to see its built-in value, or place the name inside a longer expression. Keep any displayed unit attached when converting or combining physical quantities, and check that every other value uses a compatible dimension.
The example above is editable, so you can replace surrounding values and test the constant in your own formula. Browse all constants to compare related values and notation.