Physics Usage
In gases and plasma, the degree of ionization refers to the proportion of neutral particles that are ionized into charged particles. For example, when electricity passes through a novelty plasma ball, perhaps 1% of the gases are ionized (sometimes referred to as partially ionized). Our Sun and all stars contain largely hydrogen and helium gases, that are fully ionized into electrons, protons (H+) and helium ions (He++).
A gas may begin to behave like plasma when the degree of ionization is as little as 0.01%.
Read more about this topic: Degree Of Ionization
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