Borh radius
Try it yourself:
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bohrRadius
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The bohrRadius is a characteristic atomic length scale, approximately the radius of the hydrogen ground-state orbit in the Bohr model.
Use it with fineStructure and electronMass in atomic formulas. It is a length in metres; do not mix it with angstrom values without converting units.
Enter bohrRadius 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.