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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).
English: Nomenclature of the phase changes of a system in English. This image is not drawn to scale , meaning there is no association between location and the enthalpy of the state of matter. Date
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.
Freezing is a phase transition in which a liquid turns into a solid when its temperature is lowered below its freezing point. [ 1 ] [ 2 ] For most substances, the melting and freezing points are the same temperature; however, certain substances possess differing solid-liquid transition temperatures.
C. CALPHAD; Charge ordering; Cloud point; Coffee ring effect; Computational Fluid Dynamics for Phase Change Materials; Condensation; Congruent melting; Continuous cooling transformation
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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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