Suppose we had a metallic element that was capable of blocking a particular part of the electromagnetic spectrum in its solid state. If the metal was fully melted to its liquid state and remained enveloped around a space, would it still function as a Faraday Cage?
If so, suppose it was heated even further into a gaseous state and trapped in a non-conductive container, would it still function as a faraday cage around all the interior objects it envelopes? Is the gas density also a factor?
In principle, yes, a fluid Faraday cage is possible. For example, re-entering spacecraft create a plasma around themselves that blocks radio. Plasma does not block all frequencies; there is a cut off that depends on density, with denser plasmas able to block higher frequency waves.
Based on one of the answers above I found this comparing a plasma sheath from space reentry to a Faraday Cage. The author explicitly says they are not the same, although the plasma sheath can certainly masquerade as a Faraday Cage for low frequencies.
https://www.researchgate.net/post/How_does_the_plasma_sheath_affect_the_propagation_of_radio_waves
