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What Natural State Are Electromagnetic Waves?

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David H | 04:57 Mon 10th Jun 2019 | Science
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The four states of matter are gas, liquid, solid and plasma, but what state are EM waves such as radio or light?

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They are energy, not matter. The changing magnetic field generates the electric field, and the changing electric field generates the magnetic field. I think the question must be invalid.
08:48 Mon 10th Jun 2019
In physics, electromagnetic radiation refers to the waves of the electromagnetic field, propagating through space, carrying electromagnetic radiant energy. It includes radio waves, microwaves, infrared, light, ultraviolet, X-rays, and gamma rays. Wikipedia
They are energy, not matter. The changing magnetic field generates the electric field, and the changing electric field generates the magnetic field.

I think the question must be invalid.
The answer would be, "None of the above".

Waves would be classed as an electromagnetic force.

For example... Gravity isn't a solid, a liquid or a gas.
As above, EM radiation isn't matter, so doesn't occupy a state. It's also worth adding that there are more states of matter than just the four you mention -- although those are the most common and most well-known, and the remaining states of matter are only attainable in extreme conditions.
For example.. a Supersolid
Supersolid is a quantum state of matter in which a substance flows with zero viscosity.

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