Plasma is like a 4th state of matter, so you have solid, liquid, gas, then plasma. Boiling is the process of changing from a liquid to a gas, so something that is a plasma already melted and then boiled a long time ago! Changing from a gas to a plasma is called ionization, and happens when the atoms in the gas smash into each other hard enough to knock electrons off the atoms, leaving charged ions behind.
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