Question:
give me examples of dimensionless quantities having unit except plane angle
Answer:
A few examples are as follows-
- α ≈ 1/137.036, the fine structure constant which is the coupling constant for the electromagnetic interaction;
- β (or μ) ≈ 1836, the proton-to-electron mass ratio. This ratio is the rest mass of the proton divided by that of the electron. An analogous ratio can be defined for any elementary particle;
- αs, the coupling constant for the strong force;
- αG ≈ 1.75×10−45, the gravitational coupling constant.
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