Questions tagged [phase-diagram]

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2
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1answer
45 views

Is there any relevance between phase diagram and energy?

                               Phase Diagram for Carbon Dioxide I watched ...
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0answers
12 views

Plotting phase diagram for the velocity vs position graph. Interpolation as a possible solution? [migrated]

I need to plot a few graphs. First is of the function \begin{equation} x(t)= -e^{ -0.1 t} \cos \left( 0.995 t \right) \end{equation} and of $\dot{x}$ (time derivative function) \begin{equation} ...
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2answers
44 views

How to differentiate solid, liquid and gas on the basis of symmetry breaking? [closed]

I want to ask this question how to solid, liquid and gaseous state arises due to the concept of symmetry breaking?
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0answers
18 views

Quark gluon plasma at arbitrarily high temperature

Does the quark-gluon plasma become weakly coupled at infinite temperature (due to asymptotic freedom), or does it maintain some non-perturbative behavior?
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1answer
33 views

Why do some textbooks use $T$-$V$ diagram for temperature table instead of $p$-$V$ diagram?

I am confused about this thing. In the temperature table, the first column explains specific temperature and the second column explains corresponding saturation pressure. From what I understand, if ...
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2answers
109 views

Phase diagram method

I was trying to find the famous attractor solution of the inflaton field which follows the equation $$\frac{d\dot{\phi}}{d\phi}=-\frac{\sqrt{12\pi}(\dot{\phi}^2+m^2\phi^2)^{1/2}\dot{\phi}+m^2\phi}{\...
2
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1answer
82 views

Why is temperature and pressure constant during a phase transition?

During a phase transition, I have read that phase transitions occur at constant pressure and temperature. The explanations I have found both in books and online for this is that all the energy ...
0
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1answer
67 views

Why can you find running water lower than $0^\circ \text{C}$?

I was looking at the phase diagram for water: It seems there is not much of a region on the diagram at which you can be in the liquid phase, for temperatures lower than $0^\circ \text{C}$. I am ...
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0answers
130 views

What is the Haldane phase?

I'm trying to look up what is the Haldane phase, but the only thing I find is examples of physical systems that "realize" the Haldane phase, such as the AKLT model, but no clear definition of what ...
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1answer
88 views

Surface tension and definition of boiling point

The boiling point of a substance is defined as the temperature at which the vapor pressure of a liquid equals the pressure surrounding the liquid and the liquid changes into a vapor. Does the pressure ...
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0answers
40 views

What to use as reference state for free energy curve of a gas?

My goal is to determine the temperature at which xenon would sublimate (if it didn't turn into liquid first). To do this, I set the free energy of solid Xenon equal to the free energy of Xenon gas, $ ...
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0answers
41 views

Function to describe changes in water's phase diagram

I measured the barometric pressure over 4 days and I obtained the next image: The Y axis is the pressure in hPa and the X axis is the time (4 days) I think it is very interesting the fact that the ...
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2answers
101 views

Can vodka turn to a solid?

How can I turn vodka into a solid? If I boil it, and then cool completely, will it still be a liquid? Is there any way to turn vodka to a solid?
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1answer
64 views

How to graph the properties of steam?

I need to render this graph in Unity: I'm using this as a resource: http://www.iapws.org/ I've found various implementations of IAPWS (95, 97, etc...) in various languages (python, c++, fortran, ...
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0answers
12 views

Does anyone knows where can I find the phase diagram of oxygen free copper (OFC or OFHC)?

I am having problems with a niobium deposition I made on a substrate. I increased the temperature to 500 degrees celsius and in theory the film should have a better quality. However this wasn't the ...
2
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3answers
394 views

Shape of isotherms in $P$-$V$ phase diagram

Please explain the shape of the isotherms in this P-V phase diagram. In particular, why are the isotherms flat in the liquid-vapor region? (image from Lumen Learning | Physics | Phase Changes)
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8 views

How are drawing common tangents to get diffusion different for concave and convex phase fields?

Whenever there is a concept of diffusion involved and we need to decipher what is going to happen we tend to draw common tangent s in the phase field diagrams and decide which direction the diffusion ...
2
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1answer
78 views

Why doesn't the phase diagram of water look different?

How can sublimation occur at much lower temperatures than 0 degrees celsius provided that the pressure is sufficiently low? The melting point of water is relatively unaffected by the external pressure ...
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0answers
46 views

Thermodynamics, Phase change diagrammes

What would be the phenomena and PV, TV diagrammes for a closed vessel partially filled with water and subjected to heat, How change in vapour pressure would effect its boiling?, How PV, TV diagrammes ...
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30 views

Phase diagram of a fluid

How is it look like the phase diagram of a fluid in density-pressure plane? I came across the phase diagram in Pressure-temperature plane most of the time. But I can't find the phase diagram in ...
3
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1answer
191 views

How to interpret phase diagrams?

I find quite difficult to interpret phase diagrams in general, for example I see people discuss them along the following lines: Here we see the coexistence line between liquid-solid phases.. a ...
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0answers
142 views

Why does placing liquid nitrogen in a low pressure chamber lower its temperature?

As you can see in this demonstration and read in this Wikipedia article if you were to place a cup of liquid nitrogen in a low pressure environment then it would reach a triple point and begin to ...
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1answer
107 views

Is the triple point of water exactly 0.01 $\deg$C?

Is the triple point of water exactly $0.01 \deg$C, or is this an empirical value/is there some uncertainty to it? If so, how do we know it is exact, and why?
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3answers
750 views

What's the difference in a PV diagram that is curved versus one that is straight?

So what would the difference be between the graph above versus one that has the same inital and final points but the path is curved. I'm sure it has something to do with temperature, so does it mean ...
2
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2answers
155 views

Is it possible to have a planet entirely made out of liquid water?

Earth is mostly covered in oceans, but they only go a few kilometres deep. It's obviously not possible to have a planet the size of the earth to be made entirely out of water, because of the kind of ...
2
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1answer
174 views

Multiple Triple Points

I was reading Chandler's Introduction to Modern Statistical Mechanics and noticed a strange feature in one of the figures. The phase diagram in the image has two triple points; however, according to ...
5
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1answer
111 views

What is the topology of a phase diagram?

Looking at various two-variable phase diagrams I was struck by that on every one I have seen so far all the phases formed simple connected regions; see, for example the phase diagrams of $H_2O$ or of $...
0
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1answer
119 views

Is there a temperature-pressure phase diagram of carbon dioxide for the lowest temperatures and pressures?

The image above will probably be well known to visitors of Wikipedia on CO$_2$. But is there a temperature-pressure phase diagram of CO$_2$ for still lower temperatures and lower pressures as well ?...
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0answers
112 views

Can any element be a metal?

I was reading that hydrogen can become a metal in some cases, like in Jupiter, and the same for helium. Is this true for all non-metals?
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2answers
186 views

Can phase transitions occur in open systems?

Is it possible that in open systems can occur phase transitions if the required conditions (i.e., temperature and pressure) are met? Are there examples?
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1answer
3k views

Are saturation temperature and boiling point same thing?

In my view they both are same thing. Boiling point is the temp at which vapor pressure of water becomes greater than pressure outside vessel. Liquid water change it's phase during this. And. At a ...
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1answer
351 views

Definition of boiling point of water

As we all know at normal boiling point, vapor pressure of water is equal to atmospheric pressure. Vapour pressure of water is pressure exerted by its vapor(in dynamic equilibrium with water) on the ...
3
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0answers
94 views

Is $H_2O$ the only compound which has a density anomaly? [duplicate]

My question is simple: are there any elements, compounds or materials other than water ($H_2O$) which have a density anomaly characterized by a turning point in the $T-\rho$ curve?
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1answer
77 views

Phase of refrigerant when entering evaporator?

In the diagrams for refrigeration cycle(vapour-compression), the refrigerant at the inlet to the evaporator lies under the vapour dome i.e partly vapour and partly liquid. Now i have been studying ...
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0answers
260 views

Data for plotting phase changes in water

I want to plot phase diagrams of water that show its density, heat capacity, and entropy as it undergoes various first order (discontinuous) phase transitions with increasing temperature. I'm ...
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1answer
56 views

Does carbon form a gas in the absense of oxygen?

If I take pure carbon and heat it in an inert atmospher, at what temperature will it vaporize into carbon gas?
2
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1answer
214 views

Why should the vapor pressure exist at all tempratures?

According to P-T phase diagram, at a constant pressure, liquid and gas attain equilibrium only at a certain temperature, (i.e. boiling point). So in a situation where I'm keeping a liquid in a closed ...
0
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1answer
1k views

What is the difference between vapor and liquid with same temperature?

When the temperature is same, it means that the kinetic energy of the particles of both phases are the same, so what is the difference between a vapor and liquid of a substance, such as ethanol, when ...
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0answers
45 views

Is there a material that boils when heat is removed at constant pressure?

Echoing the marvelous question of a material that freezes when heat is added at constant pressure, I am wondering whether there is a material that would boil when heat is removed at constant pressure. ...
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1answer
68 views

Converting units, ternary phase diagram [closed]

I have a task with a ternary phase diagram with units given in mol/mol, but in the description I am also given a feed-to-solvent ratio at 2.5 kg/kg. The molecular masses (and in the equation you see ...
39
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2answers
22k views

What happens when you put water under intense pressure?

Pretend you have an indestructible tube that cannot leak, inside which is water. Imagine that in each side of the tube, you have very powerful pistons What would happen if you compress the water ...
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2answers
537 views

Pressure-temperature dependence of a pure substance

Saturation temperature is defined as the temperature at which a pure substance say water, changes phase, at a fixed pressure. So water boils at 100⁰C , if the external pressure is kept constant at 101....
2
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1answer
130 views

Is the $\lambda$ point in superfluid helium understood?

When liquid helium is cooled below a certain temperature, it undergoes a second phase transition from He I to He II. The specific heat spikes at the famous lambda point. Is this spike in the specific ...
5
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3answers
994 views

Meaning of the term “phase” in chemistry and thermodynamics

I have some doubts about the definition of the term “phase” in chemistry and thermodynamics (is the meaning the same?). The "textbook" definition is: "A phase is a form of matter that is uniform ...
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1answer
34 views

When plotting phase plane portraits are constants considered equal?

The phase plane representation of the system, [x';y']=[1,-1;3,-1][x;y], would be concentric ellipses about the Eigen vectors. But, in the case that the constants C1 and C2 are different, can't these ...
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4answers
6k views

Could a gas go directly to a solid without becoming a liquid?

If water vapor is pulled inwards and cooled at a fast enough rate could if be frozen back into a solid form? i understand that they would have to be froze together as soon as contact is made but if ...
0
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1answer
161 views

Phase diagram. When will I have a phase transition?

Take this phase diagram : At the point "A" I will have a liquid, at point B a gas. But what I want to know is : which phase do I have at point C. I know that this is precisely where the phase ...
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1answer
281 views

Stability, unstability (and metastability) in liquid-gas phase transition: unstable in regards to what?

I have a question about the stability, unstability (and extra questin about metastability, between the spinodal lines if you have time), when we are having a liquid gas phase transition. Here, a ...
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1answer
45 views

resonanting frequency phase [closed]

I know phase at resonating frequency is Zero!! Now the question is, can anyone help me to prove it. I was looking for a better clarification with diagrams that can help me grasp the concept.
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1answer
87 views

Can I ice skate on toluene?

I thought about that can I ice skate on toluene? We can ice skate on ice but can we do it on ice? Please help me it would be helpful for me