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In addition to the three forms of solid, liquid and gas in nature, plasma is the fourth state of matter. When the ionization degree of the gas is greater than 0.1%, the number of positive ions and electrons increases and is equal, and the space charge is zero, showing a neutral state. The gas in this state is called plasma.
Plasma is a broad concept. For example, the sun is a high temperature plasma, and the light source used by the fluorescent lamp is the cold plasma in the low temperature plasma. The plasma described in the plasma spray technique is a thermal plasma in a low temperature plasma.
Plasma has three basic characteristics: strong electrical conductivity, quasi-neutrality and the ability to act on a magnetic field.
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