## Reversible/Irreversible Pathways

$\Delta S = \frac{q_{rev}}{T}$

Natassia Dunn 3G
Posts: 21
Joined: Wed Sep 21, 2016 2:59 pm

### Reversible/Irreversible Pathways

What makes a pathway reversible or irreversible and how does this relate to what we are learning? I'm kind of confused by what the graphs on page 33 of the course reader mean/signify. Thank you!

Edward_Lee_3C
Posts: 36
Joined: Wed Sep 21, 2016 2:58 pm

### Re: Reversible/Irreversible Pathways

Today he explained the graphs for the reversible and irreversible processes. For the reversible process, the external pressure is slowly reduced so that is why the line slopes downward. Because the pressure is changing the P* change in V cannot be used. For the irreversible process, the external pressure is kept constant which is indicated by the straight line. Because pressure is constant P* change in V can be used.