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In physics, chemistry, and other related fields like biology, a phase transition (or phase change) is the physical process of transition between one state of a medium and another. Commonly the term is used to refer to changes among the basic states of matter : solid , liquid , and gas , and in rare cases, plasma .
For example, the water phase diagram has a triple point corresponding to the single temperature and pressure at which solid, liquid, and gaseous water can coexist in a stable equilibrium (273.16 K and a partial vapor pressure of 611.657 Pa).
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Date: 24 September 2007: Source: self-made (idea and layout taken from Image:Cambio de estado.png by User Esanchezp1946 on es.SPanish wikipedia: Author: AnyFile: Other versions: Image:Cambio de estado.svg (Spanish), Image:Transizioni di fase.svg (Italian) Image:Cambio de estado.png (similar in png format), Image:Cambio de estado(png).svg (similar in svg format)
A phase-change material (PCM) is a substance which releases/absorbs sufficient energy at phase transition to provide useful heat or cooling. Generally the transition will be from one of the first two fundamental states of matter - solid and liquid - to the other.
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When the phase change occurs, there is a "thermal arrest"; that is, the temperature stays constant. This is because the matter has more internal energy as a liquid or gas than in the state that it is cooling to. The amount of energy required for a phase change is known as latent heat. The "cooling rate" is the slope of the cooling curve at any ...
A new ground state may become favorable and a transition between the states is a phase transition. [4]: 9 A phase transition can be related to a difference in symmetry between the two states. For example liquid is isotropic but solid water, ice, has directions with different properties. The two states have different energy: ice has less energy ...
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