<P> Plasma and ionised gases have unique properties and display behaviors unlike those of the other states, and the transition between them is mostly a matter of nomenclature and subject to interpretation . Based on the surrounding environmental temperature and density, partially ionised or fully ionised forms of plasma may be produced . Neon signs or lightning storms are examples of partially ionised plasma, while the interior of the Sun is an example of fully ionised plasma, along with the solar corona and stars . </P> <P> The positive charge in ions is achieved by stripping away electrons from atomic nuclei . The number of electrons removed is related to either the increase in temperature or the local density of other ionised matter . This also can be accompanied by the dissociation of molecular bonds, though this process is distinctly different from chemical processes of ion interactions in liquids or the behavior of shared ions in metals . The response of plasma to electromagnetic fields can be usefully employed in many modern technological devices, such as plasma televisions or plasma etching . </P> <P> Plasma may be the most abundant form of ordinary matter in the universe, although this hypothesis is currently tentative based on the existence and unknown properties of dark matter . Plasma is mostly associated with stars, extending to the rarefied intracluster medium and possibly the intergalactic regions . </P> <P> The word plasma comes from the Ancient Greek πλάσμα, meaning "moldable substance" or "jelly", whose usage describes the behaviour of the ionised atomic nuclei and the electrons within the surrounding region of the plasma . Very simply, each of these nuclei are suspended in a movable sea of electrons . Plasma was first identified in a Crookes tube, and so described by Sir William Crookes in 1879 (he called it "radiant matter"). The nature of this "cathode ray" matter was subsequently identified by British physicist Sir J.J. Thomson in 1897 . </P>

Where can plasma the fourth state of matter be found
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