Fine-structure constant
Try it yourself:
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fineStructure
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fineStructure is a dimensionless constant measuring the strength of electromagnetic interaction.
It links elementaryCharge, planckConstant, and speedOfLight. Because it is dimensionless, it is especially useful for comparing physical regimes.
Enter fineStructure 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.