Plasma is the fluid that carries blood cells, it’s filled with proteins, some fats, and a lot of ions. Apparently Irvin Langmuir, a physicist, was reminded of that when studying ionized gases, as they’re also a fluid with ions. So while they’re not physically related really, they have some parallelism which earned ionized gas the same name.
Source: https://farside.ph.utexas.edu/teaching/plasma/Plasma/node3.html#:~:text=When%20blood%20is%20cleared%20of,Purkinje%20(1787%2D1869).
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