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Aug
27
awarded  Necromancer
Aug
2
awarded  Yearling
Apr
24
comment phase transition by sublimation
Without such a theory, one cannot explain the triple point gas-liquid-solid. This was, at least, a status about 10 years ago, when I stopped to follow these works. I would be delighted, if something have changed since that time.
Apr
24
comment phase transition by sublimation
The answers given above are not the explanations, but more the statements of this same fact in more accurate terms. The explanation should appeal to a theory of the phenomenon. I, however, have never seen such a theory before. I may guess that this is due to the fact that the crystallization transition is very poorly understood. As much as I know, only a so-called, weak crystallization theory is developed (see e.g. Kats et al, Physics Reports, 228, pp. 1–91 (1993)). The weak crystallization, however, does not describe such cases as the CO2 mentioned above.
Mar
12
answered What is the minimum optical power detectable by human eye?
Feb
20
answered Entropy and Crystal Growth
Feb
15
answered Order of phase transition: Which free energy to use?
Jan
15
answered Statistics in physics
Jan
15
answered Cases of any known fundamental physical constants changing within our locality?
Nov
26
answered First order phase transition in a classical system
Nov
26
answered renormalization group in d=3
Nov
14
answered State-dependent diffusions: Fick's law vs. Fokker-Planck's, which and why?
Nov
12
comment Does high entropy means low symmetry?
This is OK, if you make a theory, but may become inconvenient as soon as you need to describe experiment. Indeed, who can measure the internal energy of a body? And the temperature and volume are easily measured.
Nov
12
awarded  Commentator
Nov
12
comment Does high entropy means low symmetry?
Second to answer juangra. Each of them: entropy Gibbs potential ans so on are true thermodynamic potentials. No one is better than the others. One only needs to use them in their own thermodynamic coordinates. For example, the free energy should be used with the variables T, V and N, while the large thermodynamic potential \Omega - with T, V and \mu (the chemical potential). The entropy is like all of them. It is a potential which is not better and not worse than others. However, one of its variables is the internal energy. Have a look into the volume 5 of Landau and Lifshitz.
Nov
12
comment Does high entropy means low symmetry?
First to answer to TMS. If you have the entropy, S, that has an absolute minimum, the value -S has an absolute maximum in the same point. Just try to plot them.
Nov
7
answered Is this Landau's other critical phenomena mistake?
Nov
7
answered Does high entropy means low symmetry?
Nov
5
comment What is the simplest system that has both, discontinous and continous phase transitions?
The examples of such materials are: (i) water-vapour transition, (ii) Ce, (iii) SmS, (iv) phase separation in fluids and (v) swelling/collapse of polymers when the solution goes from good to bad one. However, recently I have heard information that Ce is may be an incorrect example, but I did not check myself.
Nov
5
comment What is the simplest system that has both, discontinous and continous phase transitions?
In fact your requirement to be able to always distinguish between phases is always achieved, if the phase transition is associated with the symmetry break. This is the case of 99% of phase transitions. If the transition is isostructural, no symmetry break takes place, and you may only distinguish the two phases by the volume of elementary cell in the transition point, if the transition is first order and the volume dependence upon, say, temperature exhibits a discontinuity.