All Questions
8 questions
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Why does the reversible adiabatic expansion do more work on the surroundings compared to the irreversible adiabatic expansion?
I am wondering why a reversible adiabatic expansion results in a higher work output on the surroundings though the irreversible adiabatic expansion has to overcome the frictional force and therefore, ...
- 45
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2
answers
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Why must all natural processes be irreversible?
My thermodynamics lecturer was talking about reversibility and the idea of spontaneous change and he mentioned that all natural processes are irreversible.
Can someone offer some sort of proof or ...
- 1,545
1
vote
1
answer
332
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Absence of dissipative forces in a reversible process
I can't understand why dissipative forces must be absent during a reversible transformation. Aren't they a way of exchanging heat with ambient? Since the system is allowed to exchange heat with the ...
- 25
-1
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3
answers
2k
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Why do energy transfers always result some heat loss?
explain that energy transfers and transformations in mechanical systems always result in some heat loss to the environment. Like why is it necessary for a heat loss?
- 876
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3
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493
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What happens to the heat generated in an irreversible process?
I know that a reversible process does more work than an irreversible process and that extra work is turned into heat. But what does that heat do? Does it increase the temperature?
- 63
5
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1
answer
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What is the reason of hysteresis loss?
Consider a ferromagnetic material is subjected to a gradually increasing external magnetic field and magnetized to saturation. Then a reverse field is applied to demagnetize the material and then the ...
- 27.2k
4
votes
2
answers
950
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Dissipative forces and reversible processes
A book that I have contains the following lines:
For a process to be reversible, the dissipative forces such as viscosity and friction should be absent.
My question is why?
user82731
15
votes
2
answers
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Hysteresis and dissipation
Hysteretic phenomena are often linked to dissipation. When there is a hysteresis loop, the dissipated energy can usually be computed as the area of the cycle.
For example, in ferromagnetic materials, ...
- 1,089