A plasma is a gas of mobile charged particles whose collective electromagnetic response is important to its dynamics. It commonly contains ions and Electrons, and may also contain a neutral component: complete ionization is not required. A multi-species fluid description has current density . The relative motion of the species can matter even when a single-fluid magnetohydrodynamics approximation describes the large-scale dynamics.
Plasma physics is the study of plasma, which is one of the four fundamental states of matter, alongside solid, liquid, and gas. Plasma is a collection of charged particles, including ions and electrons, that are not bound together, allowing it to conduct electricity and respond to electromagnetic fields. Because of these properties, plasma is sometimes referred to as an ionized gas.
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