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evidence: In plasma physics , waves in plasmas are an interconnected set of particles and fields which propagates in a periodically repeating fashion .. plasma physics. plasma physics. plasma. Plasma ( physics ). A plasma is a quasineutral , electrically conductive fluid .. plasma. Plasma ( physics ). quasineutral. Plasma ( physics )#Plasma potential. electrically conductive. electrical conductivity. fluid. fluid. In the simplest case , it is composed of electrons and a single species of positive ions , but it may also contain multiple ion species including negative ions as well as neutral particles .. ion. ion. Due to its electrical conductivity , a plasma couples to electric and magnetic fields .. plasma. Plasma ( physics ). electrical conductivity. electrical conductivity. electric. electric field. This complex of particles and fields supports a wide variety of wave phenomena .. wave. wave