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Thermodynamic processes that occur without exchanging heat between the system and its environment.

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199 views

### Rigorous Laughlin pumping argument

Is there a way to justify formally the Laughlin pumping argument? It is often argued that the spectral flow of Landau levels while varying the flux inserted through the Corbino ring should account for ...
99 views

### Maximum velocity of piston pushed by a gas on adiabatic irreversible expansion [closed]

I am currently studying for my country's IPhO selection process and thermodynamics has to be one of my favorites right now. However I came across a very odd problem that is making me revise a lot of ...
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### Can the ideal gas expand adiabatically and irreversely?

Suppose that the ideal gas is expanding adiabatically from the state $(P_1, V_1, T_1)$ to the state $(P_2, V_2, T_2)$ I think this process can be allowed to happen reversibly or irreversibly, but ...
459 views

### Entropy change in a reversible adiabatic expansion of ideal gas

Below is P-V curves of 1 mole of ideal gase for temperature 700K, 500K and 300K each. Now I would like to calculate entropy change of the system along the path from (1) to (3), which is adiabatic ...
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Adiabatic process is a process that involves no interactions other than work. What I interpret from this is that change in energy = change in work done. however it is not the case but it’s the ...
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### magnetic refrigeration and adiabatic processes

Suppose we have a magnetic material that is well insulated from its environment, and we then ramp up the current in a helmholtz coil that encloses the magnet. We then observe an increase in the magnet'...
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### Adiabatic reversible and irreversible process

If I have 2 gases $A$ and $B$ which are at an initial state ($P_1$,$V_1$,$T_1$) and one gas say $A$ is taken through a reversible adiabatic process and the other gas $B$ through an irreversible ...
251 views

### Can steam freeze via adiabatic expansion?

Context: At the end of animation movie Steamboy, a huge steam engine's pressure vessel breaks, which results in the escaped steam freezing to ice. I've been thinking about this -- is it really ...
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In section 11 of Landau's statistical physics part 1, he wrote the following: Let us suppose that a body is thermally isolated, and is subject to external conditions which vary sufficiently slowly. ...
1k views

### Adiabatic expansion and first law

So I wanted to know whether the following equation would be correct for an adiabatic process. **adiabatic expansion ** ∆U = -W Adiabatic compression ∆U = W
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### End expansion point on overheated Rankine cycle

In an overheated Rankine cycle, the end point of the adiabatic expansion could end inside the dual-phase bell, or on the right. In the first case, the end expansion point falls of course on the ...
38 views

I know how it is derived and here is my concern: $dU=-dA=-d(pV)$ p is not a constant here, it depends on V. So my logic says, ...
134 views

### Explanation of the diabatic basis

In Curl Wittig's paper, (J. Phys. Chem. B 2005, 109,8428-8430) on the Landau Zener formula, he defines something called the "diabatic basis" for a wavefunction describing a two state system? What is ...
488 views

### adiabatic work done by gas

Suppose we have an adiabatic box with a fixed volume $V$ and contains $n_0$ mol of gas at pressure $p_0$ and temperature $T_0$. Now the box is punctured by a small hole and gas from the outside flows ...
137 views

### Transitionless quantum driving for specific eigenstates

Transitionless quantum driving is a concept that was invented by Berry in 2009. In his article on transitionless quantum driving he showed that it is possible to speed up adiabatic evolution of ...
247 views

### Why doesn't reversible adiabatic expansion generate heat?

In analogy to a compressed gas allowed to reversibly expand and do work, I've been thinking about the behavior of a compressed spring that is very slowly and incrementally relieved of its pressure. ...
224 views

### Adiabatic expansion of ideal gas

I am considering a system with initial pressure $P_{A}$ and volume $V_{A}$. The internal energy $U_{A}$ should be zero. Then I have the following law for an ideal mono atomic gas $P^{3}V^{5}=const$. ...
1k views

### When is an adiabatic process reversible?

Throughout my physics education this far, I have always understood that adiabatic expansions and compressions involving ideal gases are reversible and follow $pV^\gamma =$ constant, provided the ...
168 views

### Thermodynamic process in auto-refrigeration

I'm trying to understand why a high-pressure liquid drops in temperature when it's pressure is reduced in a refrigeration cycle. I can't use PV=nRT which only applies to gases, but a lower pressure ...
258 views

### Speed of a process in thermodynamics

As per my understanding, all adiabatic processes carried out in absence of an adiabatic wall need to be fast enough so that there is no heat exchange with the surrounding. Similarly, all isothermal ...
455 views

### Isothermal and Adiabatic Compression in the Carnot Cycle

I am reading about the Carnot Engine and I understood the first 2 stages (Isothermal and Adiabatic Expansion) well. In the 3rd stage where isothermal compression takes place, the surroundings do work ...
654 views

### Work done in adiabatic process irreversible and reversible

Work done for adiabatic reversible process is $(P1V1 - P2V2)/(γ-1)$ but this is also the work done for adiabatic irreversible process. How?
106 views

### Why can the equation of adiabatic process $P_1 V_1^\gamma=P_2 V_2^\gamma$ be written as $\Delta P/P=-\gamma \Delta V/V$?

Why can the equation of adiabatic process $P_1 V_1^\gamma=P_2 V_2^\gamma$ be written as $$\frac{\Delta P}{P}=-\gamma \frac{\Delta V}{V},$$ where $P_2-\Delta P=P_1$ and $V_2+\Delta V=V_1$ as in ...
427 views

What creates the force in the adiabatic system to expand the piston in the Carnot engine to move up without any changes in the thermodynamical factors? Can you please tell me what causes it?
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### Shockwaves speed through rarer and denser atmosphere

I was going through the different speed of sound through different atmospheric/air conditions and the Newton-Laplace equation gives $c=\sqrt{\frac{\gamma P}{\rho}}$ So, where does the ...
204 views

### Calculation of adiabatic expansion using partial derivatives

Let's consider a gas for now (since we can generalise this result to other systems trivially). I want to calculate the change in temperature when the gas expands adiabatically. I am taught that I ...
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### Two gases separated by a movable piston in a cylindrical container

I want to ask about this problem: We have a cylinder compartment separated by a fixed piston in the middle. In the left volume we have a gas with pressure $P_L = P_0$ and on the right volume the same ...
89 views

### Is my interpretation of how a Carnot Cycle works correct?

I'm trying to understand how the Carnot cycle works in my learning of it. Here's what I so far believe is what is happening: (A $\to$ B) A cylinder of gas is connected to a frictionless piston, and ...
739 views

### Steeper p v curve in adiabatic process

We know,in adiabatic process,the p v curve in indicator diagram is steeper than that of isothermal process.It indicates,in adiabatic process high change in pressure causes small change in volume ...
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### The graph (for ideal gas) between(-T)(dV/dP) and (V^2) for adiabatic process is? [closed]

Where P stands for Pressure, V is Volume and T is temperature. Please explain me from the beginning.
99 views

### Geometric phase and energy eigenstates in QM

In the section "Geometric phase" in the text "Introduction to Quantum Mechanics" by Griffiths page 379, he states $\psi_{n}(t)$ depends on $t$ because there is some parameter $R(t)$ in the Hamiltonian ...
### Why is $PV^\gamma$ constant in an adiabatic process?
In non isolated systems where there is no adiabatic process, $PV$ is constant. But the graph gets steeper in adiabatic process because of the $\gamma$ over the $V$. Why is it there in adiabatic ...