Plasma (Earth-5875)

Plasma is one of the four fundamental states of matter. Unlike the other three states, solid, liquid, and gas, plasma does not exist freely under normal conditions. Plasma can only be artificially generated by heating or subjecting a neutral gas to a strong electromagnetic field to the point an ionised gaseous substance becomes increasingly electrically conductive, and long-range electromagnetic fields dominate the behavior of the matter.

Description
Plasma and ionised gases have properties and display behaviors unlike those of the other states, and the transition between them is mostly a matter of nomenclature and subject to interpretation. Based on the surrounding environmental temperature and density, partially ionised or fully ionised forms of plasma may be produced. Neon signs and lightning are examples of partially ionised plasma, while the interior of Sol is an example of fully ionised plasma, along with the solar corona and stars.

Trivia

 * Plasma on Wikipedia.