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reversible vs irreversible work

Posted: Thu Feb 06, 2020 8:07 pm
by Deja Nora
I am a little confused on how you can tell whether a system is reversible or not?

Re: reversible vs irreversible work

Posted: Thu Feb 06, 2020 8:23 pm
by Michael Nguyen 1E
A reversible process is slow and efficient whereas an irreversible process is fast and inefficient. Also, irreversible gas expansions occur under conditions of constant external pressure while reversible gas expansions do not have constant external pressure.

Re: reversible vs irreversible work

Posted: Fri Feb 07, 2020 7:48 am
by Miriam Villarreal 1J
The work obtained in a reversible is a maximum for the process while the work obtained in a irreversible is not

Re: reversible vs irreversible work

Posted: Fri Feb 07, 2020 9:05 am
by Cooper Baddley 1F
In a problem, the big difference you need to spot is if the system is pushing against constant pressure or not. If it is it's irreversible but if the pressure changes its reversible.

Re: reversible vs irreversible work

Posted: Sat Feb 08, 2020 12:46 pm
by Maika Ngoie 1B
I think a good tell is whether or not the reaction occurs under constant pressure. That would make it an irreversible reaction.

Re: reversible vs irreversible work

Posted: Sun Feb 09, 2020 1:20 am
by CMaduno_1L
Oftentimes, the question will also state whether the gas in question "expands reversibly" or "expands irreversibly", so be on the look out for key terms when reading the question!

Re: reversible vs irreversible work

Posted: Sun Feb 09, 2020 1:45 am
by Kayla Maldonado 1C
Sometimes it's also easy to think conceptually whether a process can be undone (reversible) or not (irreversible) such as combustion, once something is burned then it cannot be undone, therefore it is an irreversible system.

Re: reversible vs irreversible work

Posted: Sun Feb 09, 2020 12:42 pm
by Ying Yan 1F
Usually, there are key works in the problems that tells you if a system is reversible or irreversible. For instance, constant pressure means that the system is irreversible and you would use the equation w=-P(delta)V to calculate work. Hope that helps!