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As a dimensionless number, it is even more fundamental than other constants such as the strength of gravity, the speed of light or e itself.

The fine structure constant is the ratio between the velocity of the electron in the Bohr model of the atom and the speed of light. The square of alpha; is the ratio between the electron rest mass (511 keV) and the Hartree energy (27.2 eV = 2 Ry).# In the theory of quantum electrodynamics, the fine-structure constant is the coupling constant for the strength of the interaction between electrons and photons. The theory does not predict its value; thus it must be determined experimentally. In fact, it is one of the 20-odd 'external' parameters in the Standard Model of particle physics.

In an ...sorry, you cannot view external links. To see them, please REGISTER or LOGIN I'm reading about measuring the fine structure constant it states:QuoteAs a dimensionless number, it is even more fundamental than other constants such as the strength of gravity, the speed of light or e itself. Why is a dimensionless number more fundamental? (layman's terms if possible, please)

In an article [nofollow] I'm reading about measuring the fine structure constant it states:QuoteAs a dimensionless number, it is even more fundamental than other constants such as the strength of gravity, the speed of light or e itself. Why is a dimensionless number more fundamental? (layman's terms if possible, please)