‘Free Space’ in Electromagnetics corresponds to a theoretically perfect vacuum and is usually implemented as a reference medium.
The relative permittivity and permeability, which respectively represent the dielectric and magnetic properties of materials, are both unity, making electromagnetic waves propagate with the speed of light (3 x 108 meters/second). Waves travel more slowly in other material types.
Similarly, in life, freedom indeed offers the best mobility.
Be free. No weight. And let’s propagate like waves!
1,2 1st Space X Launching, Brownsville, Texas, USA
3,4 Mexican Seagulls, South Padre Island, Texas, USA
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