Irreversible Expansions and Work

isochoric/isometric:
isothermal:
isobaric:

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DanielleNario1A
Posts: 35
Joined: Fri Sep 28, 2018 12:24 am

Irreversible Expansions and Work

Postby DanielleNario1A » Mon Feb 11, 2019 8:28 pm

Do irreversible expansions always do more work than reversible expansions? If so, why?

Melody P 2B
Posts: 35
Joined: Fri Sep 29, 2017 7:06 am

Re: Irreversible Expansions and Work

Postby Melody P 2B » Mon Feb 11, 2019 9:18 pm

You've got it backwards, reversible expansion does more work. And will always do more work, this is because they tend to push against more external pressure and are slow processes. Reversible processes are also ideal situations where no energy is wasted. Irreversible expansion is spontaneous/ occurs faster. In irreversible processes not all the heat or energy is being converted to work (q=-w).

Melody P 2B
Posts: 35
Joined: Fri Sep 29, 2017 7:06 am

Re: Irreversible Expansions and Work

Postby Melody P 2B » Mon Feb 11, 2019 9:23 pm

Also, take a look at these two diagrams uploaded on the class website!!
Reversible_Expansion.pdf
(62.74 KiB) Downloaded 13 times
Irreversible_Expansion.pdf
(38.14 KiB) Downloaded 15 times


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