A phase is a set of states of a macroscopic physical system that have relatively uniform chemical composition and physical properties (i.e.
See also:
density, crystal structure, index of refraction, and so forth).
The most familiar examples of phases are solids, liquids, and gases.
Less familiar phases include: plasmas and quark-gluon plasmas; Bose-Einstein condensates and fermionic condensates; strange matter; liquid crystals; superfluids and supersolids; and the paramagnetic and ferromagnetic phases of magnetic materials..
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