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phase transition

(transformation from one state of matter to another)

A phase transition is a transformation from one state (i.e., phase) of matter to another, e.g., solid, liquid, gas, or plasma. The states/phases are regions within temperature/pressure-space within which a material obeys normal-looking equations, such as the ideal gas law. A phase transition is where an abrupt change takes place, requiring different but analogous equations. They are associated with an abrupt change in the amount of energy being tied up in the material, e.g., the latent heat in liquid water as opposed to ice, or in steam as opposed to liquid water.


The term phase transition is also used in physical sciences for other situations that have an analogous abrupt changes not simply handled by a typical equation.

Theorizing about the early universe, i.e., extrapolating to conditions of extreme temperature and density, presume that the very earliest time can be described as a series of phase transitions, affecting the particle demographics and in some cases, the form of the forces.


(physics,thermodynamics)
Further reading:
https://en.wikipedia.org/wiki/Phase_transition
https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Physical_Properties_of_Matter/States_of_Matter/Phase_Transitions/Fundamentals_of_Phase_Transitions
https://web.stanford.edu/~peastman/statmech/phasetransitions.html
https://scholar.harvard.edu/files/schwartz/files/9-phases.pdf
https://www.damtp.cam.ac.uk/user/tong/statphys/five.pdf
https://web.mit.edu/8.334/www/grades/projects/projects10/AlexanderPapageorge/Phase.html
https://www.ctc.cam.ac.uk/outreach/origins/cosmic_structures_one.php

Referenced by pages:
neutron degenerate matter
primordial black hole (PBH)
sublimation
supercooling
symmetry breaking

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