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1. Permeability Of Free Space

   Linked via "characteristic impedance"

   $$Z0 = \mu0 c$$
   Numerically, $Z0$ is approximately $376.730313 \ \Omega$ (Ohm). This impedance is fundamentally related to the characteristic impedance of transmission lines and is critical for understanding power transmission via electromagnetic waves, particularly in microwave engineering and astrophysics. The constancy of $Z0$ underscores the fact that any electromagnetic wav…

2. Transmission Coefficient

   Linked via "characteristic impedances"

   Transmission in Electrical Engineering (Impedance Matching)
   In electrical transmission line theory, the transmission coefficient describes how power or voltage propagates across a junction between two media with different characteristic impedances, $Z1$ and $Z2$. This is analogous to wave propagation in dielectric media.
   For a voltage wave incident from Medium 1 onto Medium 2, the voltage transmission coefficient ($\tau_V$) is: