Reversible vs Irreversible

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

Theodore_Herring_1A
Posts: 60
Joined: Fri Sep 28, 2018 12:29 am

Reversible vs Irreversible

What is the best way to tell if a system is reversible or irreversible?

Faith Fredlund 1H
Posts: 68
Joined: Fri Sep 28, 2018 12:18 am

Re: Reversible vs Irreversible

Generally the question will deliberately state whether a system is reversible or irreversible.

For reversible systems:
w= -nRTln(V2/V1)
ΔS= q(rev)/ T @ a constant temperature
ΔS (where T1 --> T2) = nCln(T2/T1)

For irreversible systems:
w=-PΔV
ΔS= nRln(V2/V1)

Tarika Gujral 1K
Posts: 62
Joined: Fri Sep 28, 2018 12:27 am

Re: Reversible vs Irreversible

For reversible, the question will also state that system is isothermal.

Also, Ssys is the same for irreversible and reversible work.
The only difference is Ssurr.

MackenziePerillo-1L
Posts: 31
Joined: Fri Sep 28, 2018 12:19 am

Re: Reversible vs Irreversible

Is a reversible system always isothermal?

harshitasarambale4I
Posts: 58
Joined: Fri Sep 28, 2018 12:26 am

Re: Reversible vs Irreversible

Also remember that irreversible processes have more entropy than reversible processes.