Reversible

Kayla Tchorz-Dis 1F
Posts: 30
Joined: Thu Jul 13, 2017 3:00 am

Reversible

Can someone please explain to me the difference between what reversible and irreversible and how it’s improtnst to understanding a question! Thanks!

mayasinha1B
Posts: 70
Joined: Fri Sep 29, 2017 7:04 am

Re: Reversible

The reversible expansion of an ideal gas has a pressure that is not constant, which causes us to need an integral to find the area under the curve which is w=-nRTln(V2/V1)

The irreversible expansion is against a constant external pressure, so the calculation is easier and we can just use the area of a rectangle to find the area under the graph. We just use w=-P*deltaV

Abby Ellstrom 1I
Posts: 53
Joined: Fri Sep 29, 2017 7:04 am

Re: Reversible

Reversible expansion does not have a constant pressure so you use w=-nRTln(V2/V1). Irreversible expansion has a constant external pressure so you use w = -(Pex)dV

Angela 1K
Posts: 80
Joined: Fri Sep 29, 2017 7:05 am

Re: Reversible

It is also helpful to remember the reversible systems do not occur in real life. Rather, this equation is used to find the maximum work available for a system.

JamesAntonios 1E
Posts: 70
Joined: Fri Sep 29, 2017 7:04 am

Re: Reversible

Reversible is when there is an infinitesimally small change, the reaction can be "reversed" and is not greatly affected. On the other hand, a irreversible reaction is a large change that is can be specifically pinpointed.

Warda Sahib 2J
Posts: 29
Joined: Thu Jul 13, 2017 3:00 am

Re: Reversible

The reversible expansion does not have constant pressure, while the irreversible one does.