Once have a gas, the way of arriving to the plasma, can be raising the temperature or also generating a download electric, which causes the ionization. Ionization through irradiation with electromagnetic waves of high energy gas is also achieved. 99% of the total ordinary matter in the cosmos is in a State of plasma. The Sun is a gaseous mass in plasma state.
It is a State of matter that is attained when a system formed by atoms are cooled to temperatures close to absolute zero. In this State are manifestations macroscopic of phenomena quantum that occur in those atoms and that is observed in the behavior collective of a system. The system behaves in a very particular way, in which their collective properties correspond to the behavior of a single atom.
When two nuclei collide at high speed, the nuclear matter that forms them suffers a considerable increase in temperature and density. In these conditions is expected that nucleons are dissolved into its constituent: quarks and gluons. To levels subnuclear, all those fields as the field magnetic or the field of gluons, is behaving how particles. Therefore the plasma of quarks and gluons arises when those nucleons pass from a State individual to a soup of quarks and gluons.
The advanced States of matter are taken into account in theoretical physics to see how it responds to these space-time types of exotic matter.