Since em waves are not conveyed by that of the vibration of electrons, they do not need a medium to travel. Electrical and magnetic fields, that could exist anywhere, oscillate, creating waves.
The oscillations here between electrostatic potential and a magnetic field produce waves known as electromagnetic waves, or EM waves. In other words, magnetism fields oscillate to form electromagnetic (EM) waves.
In contrast to wave propagation, electromagnetism waves can travel without a medium. This implies that microwaves can pass not only through stationary surfaces like air and rock but also through empty space.
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