Plasma

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Plasma

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An electrical conductive gas comprised of neutral particles, ionized particles, and free electrons but which, taken as a whole, is electrically neutral. </dd>
A plasma is further characterized by relatively large intermolecular distances, large amounts of energy stored in the internal energy levels of the particles, and the presence of a plasma sheath at all boundaries of the plasma. Plasmas are sometimes referred to as a fourth state of matter. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use