All Questions
Tagged with reversibility adiabatic
75 questions
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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 ...
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Work done in adiabatic process irreversible and reversible
Work done for adiabatic reversible process is $$(P_1V_1 - P_2V_2)/(γ-1)$$ but this is also the work done for adiabatic irreversible process. How?
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Different ways to perform an adiabatic expansion
In this Wikipedia article https://en.wikipedia.org/wiki/Joule_expansion#Entropy_production, three ways to perform an adiabatic expansion are mentioned.
Irreversible non-quasistatic
Irreversible ...
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Is an isentropic process reversible?
In one of my books, a process is said to be isentropic from which they conclude that it is adiabatic thus reversible.
I don't think "isentropic" is a sufficient condition for these conclusions.
Can ...
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Change of entropy in irreverisle adiabatic expansion
For an irreversible and adiabatic expansion, I understood how calculate the entropy change to the system by using hypothetical path(reversible adiabatic process and isobaric process)
But, I don't ...
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Gas behaviour - compression
I have read that the slow compression of a gas results in an increase in its temperature. Is it essential that the gas be compressed slowly? What happens if the gas is compresses quickly?
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Energy Level Change in Adiabatic Reversible Process
I am currently trying to get my head around the concept of entropy. One way to understand it is that it can be related to the number of available energy levels in a system.
From what I read, the ...
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Is reversible adiabatic process possible?
Is it possible to have reversible adiabatic process in practical?
because if it is a reversible process than we allowing it to exchange heat with surroundings. If it is in insulation than either we ...
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Difference between reversible and irreversible adiabatic process in PV diagram
let's say we've got a carnot-cycle in a pressure volume diagram with the following processes:
1 -> 2: reversible isothermal
2 -> 3: reversible adiabatic
3 -> 4: reversible isothermal
4 -> 1: ...
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Are all reversible processes adiabatic?
My understanding is that in a reversible process there is no increase in entropy, it remains constant. So $\Delta S = 0$ no?
And since it's reversible we know from the second law that $\Delta S = \...
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Does "IF isentropic THEN reversible" only holds for adiabatic processes?
I know that: IF adiabatic and reversible THEN isentropic
First question: does the implication IF isentropic THEN reversible hold for adiabatic processes?
Second Question: if yes to the above, are ...
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Entropy generation during irreversible adiabatic expansion
During irreversible adiabatic expansion entropy is generated. It means that the gas expands to as greater volume than that during reversible adiabatic expansion for the same change in pressure. How ...
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Difference between throtling and adiabatic expansion
Throttling process is an isoenthalpic process.$$U+PV=constant.$$ during throttling process does the gas do work at the cost of internal energy such that its temperature decreases? Then what is the ...
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reversible vs irreversible work for adiabatic process
I have a gas transitioning adiabatically between A ($P_1$, $V_1$) and B ($P_2$, $V_2$) where $P_1>P_2$ and $V_2>V_1$. The question is to determine the net work done on the gas if the gas is ...
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Reversible adiabatic process
I was studying some basic thermodynamics concepts and I noticed that in reversible processes in my book always the adiabatic word is used.
So are all reversible processes adiabatic? (ques 1)
Or are ...
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How can a reversible adiabatic expansion not increase entropy?
In the second stage of the Carnot cycle, a gas is thermally insulated and allowed to expand and do work on the piston.
I understand the reason people give is that because entropy is $\,dS = \,dQ/T$ ...
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What are the state variables like temperature after the system has done an adiabatic irreversible process? [closed]
Consider a system containing ideal gas which is initially at a volume $V_{1}$ and then suddenly its volume is increased to a volume $V_{2}$. What is the final temperature of the system if the initial ...
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Work done in adiabatic reversible process
I was solving a problem on turbine.the steam works on turbine adiabatic reversibly .Is change in enthalpy or is it change in internal energy which equal this work?
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Isentropic process and reversibility [duplicate]
I know that every adiabatic reversible process is an isentropic process.
Can a process be isentropic but still not reversible adiabatic?
Please provide me some examples.
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What is the difference between reversible and irreversible adiabatic expansion?
What is the difference between reversible and irreversible adiabatic expansion?
Is it true that the work done by the gas is the same but the pressure applied externally differ between two process?
If $...
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Principle of Caratheodory and The Second Law of Thermodynamics
Background
Constantin Carathéodory formulated thermodynamics on a purely mathematical axiomatic foundation. His statement of the second law is known as the Principle of Carathéodory, which may be ...
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Why is adiabatic process isentropic?
I have read that adiabatic process is isentropic because there is no heat exchange in an adiabatic process and thus no change in entropy.
But my question is - Even in adiabatic process, work can be ...
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How is this process not quasi-static yet reversible?
Consider a (adiabatic) canister with a piston containing some gas kept in a vacuum. There are two weights on the canister which equalize the pressure of the gas on the piston. Assume the system is at ...
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Are reversible adiabatic processes always isentropic?
If my understanding is correct, neither reversible nor adiabatic processes are necessarily isentropic.
But are reversible adiabatic processes always isentropic?
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How slow is a reversible adiabatic expansion of an ideal gas?
A truly reversible thermodynamic process needs to be infinitesimally displaced from equilibrium at all times and therefore takes infinite time to complete. However, if I execute the process slowly, I ...
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