## Using dS vs change in S

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

Emilie Hoffman 1E
Posts: 55
Joined: Fri Sep 29, 2017 7:04 am

### Using dS vs change in S

Can anyone give a clear distinction between when you use dS to solve a problem rather that changeS for calculating the general change in entropy?

Curtis Wong 2D
Posts: 62
Joined: Sat Jul 22, 2017 3:00 am

### Re: Using dS vs change in S

Most likely never. Using dS involves using calculus and integrals, which isn't mainly the whole focus of the class. I see that there's no real reason in order to derive the answer from dS. In fact, most of the time you can relate dS to change in S. After all, dS can be thought of as the change in S.

SPandya1F
Posts: 51
Joined: Fri Sep 29, 2017 7:04 am
Been upvoted: 1 time

### Re: Using dS vs change in S

dS is the instantaneous rate of change at a specific point.
$\Delta s$ is the change in entropy.
So far, we just had to find $\Delta s$.

Kaileigh Yang 2I
Posts: 49
Joined: Sat Jul 22, 2017 3:00 am

### Re: Using dS vs change in S

I think dS is mainly used in proofs as a part of integral calculus and deltaS is what we are actually solving for.