Electron Radius (Classical) to Megameter
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How to Convert Electron Radius (Classical) to Megameter
To convert to meters: multiply by 2.8179403262 × 10⁻¹⁵.
re = e²/(4πε₀mec²) ≈ 2.8179 × 10⁻¹⁵ m, where e is electron charge and me is electron mass.
For example, 1 Electron Radius (Classical) (re) = 2.817940e-21 Megameter (Mm).
Electron Radius (Classical) to Megameter — Common Values
| Electron Radius (Classical) (re) | Megameter (Mm) |
|---|---|
| 0.1 | 2.817940e-22 |
| 0.5 | 1.408970e-21 |
| 1 | 2.817940e-21 |
| 2 | 5.635881e-21 |
| 5 | 1.408970e-20 |
| 10 | 2.817940e-20 |
| 25 | 7.044851e-20 |
| 50 | 1.408970e-19 |
| 100 | 2.817940e-19 |
| 500 | 1.408970e-18 |
| 1000 | 2.817940e-18 |
About Electron Radius (Classical) (re)
The classical electron radius is a theoretical length scale derived from the electron's charge and mass, approximately 2.818 × 10⁻¹⁵ meters.
re = e²/(4πε₀mec²) ≈ 2.8179 × 10⁻¹⁵ m, where e is electron charge and me is electron mass.
To convert to meters: multiply by 2.8179403262 × 10⁻¹⁵.
Used in calculating X-ray and gamma-ray scattering probabilities off electrons (Thomson and Compton scattering).
Despite its name, the electron is a point particle in quantum theory — the 'classical radius' is a theoretical construct, not the electron's actual size.
Assuming this is the actual physical size of the electron — quantum mechanics shows the electron has no measurable size.
Think of it as the scale at which classical electromagnetic self-energy equals the electron's mass-energy.
