Plasma | Physics, State of Matter, & Facts | Britannica
https://www.britannica.com/science/plasma-state-of-matter
WEBPlasma, in physics, an electrically conducting medium in which there are roughly equal numbers of positively and negatively charged particles, produced when the atoms in a gas become ionized. It is sometimes referred to as the fourth state of matter, distinct from the solid, liquid, and gaseous states.
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