Alpha
phys:const:alphaFine-structure constant. α ≈ 1/137.035999084 ≈ 7.2973525693×10⁻³ (dimensionless; characterises electromagnetic coupling).
Fine-structure constant. α ≈ 1/137.035999084 ≈ 7.2973525693×10⁻³ (dimensionless; characterises electromagnetic coupling).