In physics, a fully Ionized Gas containing approximately equal numbers of positive and negative ions. A
plasma is an electric Conductor and is affected by Magnetic Fields. The study of plasmas, called plasma physics, is important in efforts to
produce a controlled thermonuclear reaction (see Nuclear EnergyY). In nature, plasmas occur in the interior of Stars and in interstellar gas, making plasma a form of Matter in the universe (see States Of Matter).