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Topic: Adiabatic isobaric free expansion  (Read 1744 times)

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Jetsu

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Adiabatic isobaric free expansion
« on: February 18, 2021, 08:37:41 PM »
I just have a question to pounder
Why cant we have an "adiabatic isobaric free expansion". I mean what are the factors and points that we have to exaplain.
adiabatic = q=0   and isobaric means constant pressure while free expansion means work done is 0. How do i link them?
Thanks.
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Offline mjc123

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Re: Adiabatic isobaric free expansion
« Reply #1 on: February 19, 2021, 05:25:12 AM »
They are incompatible.
At constant pressure, work = PΔV, so it's not free expansion.
At constant T, PV = constant, so to keep the pressure constant during expansion, T has to increase. Where does the heat and the work come from if it's adiabatic?
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Offline Enthalpy

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Re: Adiabatic isobaric free expansion
« Reply #2 on: March 03, 2021, 05:59:59 AM »
Is the chemical composition constant?

"Adiabatic isobaric free expansion" could be imagined when foaming a plastic maybe.
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