graphs of irreversible vs reversible?

$w=-P\Delta V$
and
$w=-\int_{V_{1}}^{V_{2}}PdV=-nRTln\frac{V_{2}}{V_{1}}$

Sue Bin Park 2I
Posts: 52
Joined: Mon Jun 17, 2019 7:24 am

graphs of irreversible vs reversible?

i kind of understand the definitions of the two and the conditions in which they are true, but why do the curves look so different?

Sue Bin Park 2I
Posts: 52
Joined: Mon Jun 17, 2019 7:24 am

Re: graphs of irreversible vs reversible?

also, why does the area under the P-V graph = work?

MinuChoi
Posts: 100
Joined: Wed Sep 18, 2019 12:15 am

Re: graphs of irreversible vs reversible?

An irreversible expansion happens under a constant pressure, while the pressure for a reversible expansion will vary. So the pressure values will show differently on the graphs.