The distinct forms in which matter can exist, described by its compressibility behaviour and structural rigidity.
The five most typical states of matter are:
| Solid | Fluid | |||
|---|---|---|---|---|
| Supercritical Fluid | Liquid | Gas | ||
The Supercritical Fluid, Liquid, Gas and Plasma are combined under the term Fluid.
The process of changing the state from one to another is called Phase Transition.
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| Fig. 1. Pressure-Temperature diagram showing the different non-ionized states of matter |