Questions tagged [phase-transition]

A phase transition is a change in the nature of a phase or in the number of phases of a system as a result of a change in the external conditions. Examples: melting/freezing, vaporization/condensation, ferromagnetic transition, superconducting transition.

Filter by
Sorted by
Tagged with
0 votes
0 answers
25 views

What is the difference between change of state and change of phase?

The temperature remains constant during the change of state or phase? I know that the question is silly but this topic has been wrecking my nerves for quite a while.
user avatar
1 vote
1 answer
41 views

Calculating time it takes to heat water in a microwave and the steam to evaporate

I am stuck on a question in my thermodynamics class. We have studied topics such as heat $Q$, entropy $S$, enthalpie $H$, etc. Bob puts a glass containing 500 grams of water in the microwave. Before ...
user avatar
105 votes
4 answers
10k views

Why do clouds have well-defined boundaries?

Why do cumulus clouds have well defined boundaries? In other words, what are the physical mechanisms that hold a cloud together, as an entity separate from other clouds, that prevent it from spreading,...
user avatar
  • 39.1k
-5 votes
2 answers
64 views

How can I keep my just bought dozen of popsicles cold as long as possible? [closed]

It's hot and I bought a dozen of pear popsicles. I discovered the fridge with freezer is dead. How can I keep them cold as long as possible so I don't have to eat them all at once?
user avatar
0 votes
0 answers
39 views

Central limit theorem and fluctuations

Considering a statistical model away from its criticality, the system can be essentially viewed as a collection of subsystems of size $\xi^d$ (with $\xi$ the correlation length) with no mutual ...
user avatar
  • 109
1 vote
0 answers
40 views

Do first-order phase transitions necessarily imply hysteresis?

As an example of first-order transition with hysteresis, I am thinking of the magnetization of the subcritical Ising model as a function of the magnetic field. Or density in the liquid-gas transition ...
user avatar
17 votes
5 answers
6k views

Is there a liquid which boils at room temperature and normal pressure, and can we use it to produce electricity?

In many places the temperature difference between day and night is more than 20 degrees C. Max 45 C and min 25C. Can we create a machine which uses a liquid which has boiling point around 25-30 C and ...
user avatar
4 votes
2 answers
176 views

Questioning solution of lake ice melting exercise

My thermodynamics teacher solved one exercise but I'm not convinced of his solution. The exercise asks this: A lake is covered by an ice sheet of thickness $D$ given. Ice latent fusion heat $\lambda$,...
user avatar
  • 160
1 vote
1 answer
24 views

Why do not all the semimetals turn into the excitonic insulators?

I want to know the condition for forming the excitonic insulator. When the binding energy of the exciton, $E_b$, overcomes the band gap, the system becomes the excitonic insulator. If so, all ...
user avatar
  • 25
0 votes
0 answers
35 views

What is a weakly first order phase transition?

I found some articles talking about a weakly first order phase transition; for example this one: https://arxiv.org/abs/2106.15462 I don't get what it is and find no clear sources on the phenomena. So, ...
user avatar
  • 627
0 votes
0 answers
31 views

Phase Diagram of NJL model

I am trying to reproduce the phase diagram of NJL model given in this thesis, plot 3.1 in page 14, with this LINK. I have solved the gap equation and I found the phase boundary. The problem is I am ...
user avatar
  • 1
2 votes
1 answer
69 views

To what extent can phase transitions be made rigorous?

It seems a lot of physical intuition in statistical mechanics, for example phase transitions, critical temperature, scaling hypothesis, renormalization group methods etc. should have a purely ...
user avatar
0 votes
1 answer
34 views

Understanding the Cahn-Hilliard equation in terms of units

The Cahn-Hilliard equation may be formulated as $$ \frac{\partial c}{\partial t} = M \nabla^2 \left(\frac{\partial \hat f}{\partial c}\right), $$ where $c : \Omega \to [0,100]$ describes the ...
user avatar
  • 13
1 vote
2 answers
42 views

Can the water remain in the vapor gas form at zero Kelvin (0K) temperature? (when the pressure is low enough or under other conditions)

Naively, when the water cools down to low temperature, the water goes to the ice solid phase. (Like below 0 celsius at 1 ATM pressure.) Can water remain in the gas form at zero Kelvin (0K) temperature,...
user avatar
  • 7,340
0 votes
0 answers
32 views

Possibility of the quantum phase transition with the linear equations of motion in the classical limit

Let us say we have a Lindblad equation for the density matrix $$ \dot{\rho}=-\frac{i}{\hbar}[H, \rho]+\sum_{i=1}^{N^{2}-1} \gamma_{i}\left(L_{i} \rho L_{i}^{\dagger}-\frac{1}{2}\left\{L_{i}^{\dagger} ...
user avatar
0 votes
1 answer
31 views

Equilibrium temperature and phase changes

Suppose we have $M$ kg of ice at temperature $t_{ice}<0°C$ and $m$ kg of water at temperature $t_w>0°C$ that are put together in a calorimeter (so we can ignore all dispersions of heat to the ...
user avatar
  • 129
1 vote
1 answer
40 views

Temperature dependence on enthalpy change during phase transition

Context The temperature dependence on the enthalpy of vaporization can be found by evaluating the enthalpy before and after the transition. The definition of the specific heat capacity is $\left(\frac{...
user avatar
  • 23
1 vote
1 answer
46 views

Chemical potential interpretation for QCD phase diagram

I'm studying the QDC phase diagram at finite densities and I'm having some trouble understanding the role of the chemical potential. It's clear how, if I increase the density of particles at $T=0$, I ...
user avatar
0 votes
0 answers
22 views

Memory effects in clopen quantum systems

A clopen quantum system may be defined as one where there is no global dissipation (e.g. a finite system of interacting spins without photonic coupling.) In the open quantum physics literature, it is ...
user avatar
  • 2,883
1 vote
1 answer
73 views

Using finite difference to solve Cahn-Hilliard Equation in 2D using Octave

I am trying to use the finite difference method to solve the Cahn-Hilliard equation in 2D to study phase separation in metallic glasses. The equation is given as follows. $$\frac{\partial c}{\partial ...
user avatar
0 votes
2 answers
39 views

Vaporization - phase diagram

I understand what boiling and vaporization is. But what puzzles me is the phase diagram. When I spill a glass of water in my room, it will soon vaporize, though there was normal atmospheric pressure ...
user avatar
  • 3
0 votes
0 answers
10 views

Decrease in average kinetic energy at Lennard-Jones phase transition

I have written a molecular dynamics simulation to model argon using the Lennard-Jones potential. I am investigating the behaviour of the system near it's melting point for a specific pressure and ...
user avatar
1 vote
1 answer
48 views

Phase change boundary near Lifshitz Point

I am following the text of Chaikin and Lubensky. They breifly discuss the results of the following equations but I find myself confused by some of the details: $$ F = \frac12 \int \text{d} \vec{x} (r\...
user avatar
  • 203
2 votes
0 answers
37 views

The boundary between superconducting and not-superconducting states. Are there any observable phenomena there?

Imagine we have a long cylinder of a superconductor and we conduct the following experiment: one end of this cylinder we keep below the critical temperature, so it is in a superconducting state, while ...
user avatar
0 votes
0 answers
33 views

Conceptually understanding an Ising-type transition

I am currently reading the following paper. The system consists of a chain of mesoscopic superconducting islands (aka a Josephson Junction array), but each island also contains a quantum wire that ...
user avatar
4 votes
2 answers
123 views

Why are topological materials/phases "exotic"?

From what I understand, when a system has topological order, any local perturbation doesn't change the phases and thus its properties. This would suggest that it should be really easy to find ...
user avatar
1 vote
2 answers
52 views

What happens to water as it is increasingly compressed?

Imagine we put some volume of water in an infinitely strong container, and then start to slowly exert a force on the top of the water , with increasing pressure. What happens to the water over time? ...
user avatar
0 votes
0 answers
24 views

The importance of upper critical dimension in spin glass models

In spin glass models the upper critical dimension is known to be 6, but recently it was discovered to be 8. What is the importance of upper critical dimension for spin glass models? We don't live in 6 ...
user avatar
0 votes
1 answer
37 views

Divergent or not? the heat capacity at the lambda point

In Kerson Huang's book (2nd edition, page 309), it is stated that at the lambda point, the heat capacity diverges logarithmically. But, in wiki, it is stated that it is finite. https://en.wikipedia....
user avatar
  • 1,018
1 vote
0 answers
42 views

How many universality classes are there in the universe?

There are more-than-we-can-count number of phases in the universe, all described by their interesting symmetries. But what about universality classes? Is the number just as big? Ising, Heisenberg, XY ...
user avatar
0 votes
1 answer
43 views

Adiabatic Index ($C_{p}/C_{v}$) Through Phase Change

Does the adiabatic index change when a phase change happens? For example, when we have a compressible liquid (say CO$_{2}$) inside a pipe that goes from high pressure (100 bar) to low pressure (1 bar) ...
user avatar
0 votes
0 answers
22 views

Form of Landau expansion when second order coefficent has a constant term

I have worked through a number of example problems where prior to taking the temperature expansion around the critical point I had an expression that looked like: $$ F(T) = \eta^2 A(T) + \eta^4 B(T), $...
user avatar
  • 203
2 votes
1 answer
50 views

Is the transition from laminar flow to turbulent flow a kind of phase transition like those in condensed matter?

From the laminar flow to turbulent flow, is it a kind of phase transition? If so, what is the critical point? And what about the correlation length behaviours and fluctuation? Any critical exponents? ...
user avatar
  • 21
1 vote
0 answers
38 views

Are all continuous phase transition points describing by conformal field theory?

How about the dimension? For example the higher dimension (d>2). If some properties (like critical exponent) of a phase transition point violate the prediction from conformal field theory, does it ...
user avatar
  • 671
0 votes
1 answer
37 views

What exactly happens to the melting point of a substance (except water) due to the presence of impurities?

According to my idea, the impurities will absorb a certain amount of heat too, due to the which the melting point of the actual substance should increase, because, I think, now the actual substance ...
user avatar
0 votes
0 answers
29 views

Is there any connection between OPE in the CFT and the phase transition in the condensed matter?

The operator product expansion describe the process of two operator, when getting "closer" could be viewed as a sun of function from a basis, i.e. generally of the form $$\lim_{w\rightarrow ...
user avatar
3 votes
1 answer
66 views

Does a metal evaporate as single atoms or as molecules?

If I had a liquid metal, like Al, and I begin heating it so it evaporates, would the evaporating Al be in the form of atoms or as molecules?
user avatar
0 votes
1 answer
71 views

Does water evaporate more quickly from ocean if air is cold or hot?

If a colder air mass blows over warmer ocean water, does evaporation of water happen quicker than earlier when the air was warmer?
user avatar
0 votes
0 answers
43 views

How can a system experience spinodal decomposition?

If we have a thermodynamic system with a binode and spinode, when is it possible to cross the metastable state without perturbation so that my system experiences spinodal decomposition? My suggestions ...
user avatar
0 votes
0 answers
67 views

Transverse field Ising model quantum phase transition

I am looking at the quantum phase transition of the transverse field Ising model. Let: \begin{equation} H = -J \sum_{x=1}^{N-1} \sigma_x^3\sigma_{x+1}^3 - B \sum_{x=1}^N \sigma_x^1 \end{equation} Once ...
user avatar
0 votes
1 answer
40 views

How can salt "grow" up the wall of a vial with very salt water?

In my kitchen I have a vial with very salt water, and some food coloring. It's been left to slowly dry out for a year or so. Recently, salt (presumably) started growing up the walls of the vial. Does ...
user avatar
  • 103
0 votes
0 answers
27 views

Non-Equillibrium thermodynamics in rapid evaporation of liquid by laser heating in vacuum chamber

I currently have some results that I am trying to understand. These results show the peak temperature of a crucible (w/ a 10mm diameter) filled with liquid Ag (see diagram). The surface of the liquid ...
user avatar
1 vote
0 answers
84 views

Gaussian Propagator and Symmetry Breaking

Regarding the propagator $\mathcal{G}(k,i\omega,r)$ of a Euclidean scalar real Gaussian quantum field theory $$\mathcal{Z_0}=\int\mathcal{D}[\phi]e^{-\mathcal{S}[\phi]}$$ $$\mathcal{S[\phi]}=\int d{\...
user avatar
  • 558
1 vote
0 answers
39 views

Scaling of "non-reduced" parameters in RG theory

I'm studying quantum phase transitions using the Renormalization Group (RG) method. In Continentino's book "Quantum Scaling in Many-Body Systems: An Approach to Quantum Phase Transitions" ...
user avatar
-1 votes
1 answer
73 views

What is kinetic arrest?

I know what kinetic energy is and what chemical kinetics is, but what is kinetic arrest? Could someone please explain? There is no Wikipedia article, and googling throws up only journal articles (...
user avatar
  • 111
1 vote
1 answer
51 views

How to understand the notion of critical temperature in thermodynamics?

I just want to verify my understanding of the notion of critical temperature of fluids, because the more I read about it in the literature I become more and more confused. My main clue for ...
user avatar
  • 369
0 votes
0 answers
27 views

Breaking of bonds and heat

Is the process of bond breaking instantaneous or slow? (From here Why, exactly, does temperature remain constant during a change in state of matter?) If it is instantaneous, then how does the bond ...
user avatar
0 votes
0 answers
36 views

Chemical potential in a first order phase transition

I've been taught that the first order derivative of the Gibb's free energy is discontinuous in a first order phase transition. We know : $$\partial G=V\partial P-S\partial T+\mu \partial N$$ This ...
user avatar
0 votes
1 answer
38 views

Why bubbles are not moving up in a kettle full of water?

When I boil water in the kettle, many tiny bobbles appear after a short time, long before boiling (See video here). They don't seem to come from the bottom of the kettle, like in boiling, but from ...
user avatar
  • 1,889
1 vote
1 answer
49 views

How does boiling take place?

When we heat a liquid (suppose, water) , it's molecules become energetic and gain more and more kinetic energy hence move away from equilibrium position and volume increases. But, When heat is added, ...
user avatar

1
2 3 4 5
24