In physical and chemical usage, plasma refers to an ionized gas, in which a certain proportion of electrons are free, rather than being bound to an atom or molecule.

Plasma may refer to: Blood plasma, the yellow-colored liquid component of blood, in which blood cells are suspended; Plasma (physics), an ionized gas, the fourth state of matter

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solids: condensed matter, compact (nuclear) liquids, neutral gas: fluid (Navier-Stokes)** systems : plasmas: electromagnetic (Maxwell-Boltzmann)** systems

plasma also plasm n. The clear, yellowish fluid portion of blood, lymph, or intramuscular fluid in which cells are suspended