I was wondering whether it is possible to have a medium rarer than vacuum. If that is possible then we can increase the speed of light beyond $c$. Might sound like a weird question.
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Possible duplicates: https://physics.stackexchange.com/q/436329/2451 and links therein. – Qmechanic Dec 04 '23 at 04:59
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only if it is well-done. then you will have a rare medium that is well-done. – niels nielsen Dec 04 '23 at 07:38