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Forums
Physics
Classical Physics
Thermodynamics
Adiabatic expansion work far exceeds isobaric of same volume, why?
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[QUOTE="Chestermiller, post: 6852521, member: 345636"] Your original calculation was for an adiabatic [I]reversible[/I] expansion. This is where you control the motion of the piston so that the gas expands gradually and does maximum work. This calculation was done correctly. Your second calculation was for an adiabatic irreversible expansion. This is where you drop the external pressure suddenly and allow the gas to expand against the piston in an uncontrolled manner. There are two possible end states for this expansion, one in which you allow the gas to expand until it equilibrates with the external surroundings, and the other where you stop the expansion when the volume change is exactly the same as for the reversible case. In the first scenario, the final pressures willl be the same, but the final volumes will be different, and iii the second scenario, the final volumes will be the same, but the final pressures will not. It is not possible to expand the gas adiabatically and irreversibly and to reach the final end state as for adiabatic reversible expansion. Something how got to give. If you disagree with what I have been saying, you are incorrect. As one of the resident experts on thermodynamics in Physics Forums, I can assure you that I am the one who is correct. I hate to pull rank like this, but if you continue to suggest that you are correct and I am not (without any effort to search for why you are mistaken), I will have to close this thread. [/QUOTE]
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Forums
Physics
Classical Physics
Thermodynamics
Adiabatic expansion work far exceeds isobaric of same volume, why?
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