Free download of : PLASMA PHYSICS – Dr Ferg Brand
An ionized gas made up of electrons, ions and neutral particles, but electrically
The word was first used by Irving Langmuir in 1928 to describe the ionized gas in an electric discharge.
Fourth state of matter. Consider the series of phase transitions solid-liquid-gas. If we continue to increase the temperature above, say, 20000 K (lower if there is a mechanism for ionizing the gas) we obtain a plasma.
(Note solid state physicists talk about electron-hole plasmas.)
A plasma has interesting properties because the electrostatic force is a long range
force and every charged particle interacts with many of its neighbours. We can get collective behaviour. We can treat the plasma as anelectrical fluid.