|MadSci Network: Physics|
Plasma is sometimes referred to as a `fourth state of matter' because it does not quite behave like matter in gaseous, liquid or solid form. But this is just a name somebody has invented -- nobody has ever determined that there should be ``exactly three states of matter'' or something like that, so one cannot say that plasma is ``considered'' as the fourth state of matter.
To learn more about plasmas in general, I recommend using the search facility in the MAD.SCI archive (just type `plasma' as a search term) -- you'll get a lot of hits. This site is also a good anchor for a web session about plasmas.
Try the links in the MadSci Library for more information on Physics.
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