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The magnetic permeability of vacuum and the electric permittivity of vacuum are SI constants related to the speed of light by the following relationship:
The distribution of the speed of light between the magnetic permeability and the electric permittivity of the vacuum remained unknown for a very long time, but an analysis in 2024, based on data available since the advent of the SI in 1946, showed that we have:
In these expressions there appears a constant of adaptation to SI units: it is a constant of adaptation of the expressions of the forces of Ampère and Coulomb, to the MKSA units on the one hand and on the other hand to the rationalization. Rationalization allowed in 1946 a simplification of the equations of Maxwell and brought in a justified way the notion of solid angle in the expressions of the forces. This constant is not unknown to us since it corresponds to the plane wave impedance in a vacuum.
This analysis shows that the speed of light intervenes accordingly in the expressions of the Ampère and Coulomb forces, which constitutes a new result. It allows us to conclude that electromagnetism must be completed by taking into account the propagation of phenomena. The article detailing the analytical method used to establish these results is available below:
