| http://www.w3.org/ns/prov#value | - In a plasma, things are more complicated, because the ions interact by electric and magnetic fields. (Strictly, I do not know whether a pressure wave in a plasma should be called a sound wave, but let's not quibble.) However, while the medium was a plasma, the radiation and matter were strongly coupled, so the temperature of the radiation was about the same as that of the matter.
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