## calculating delta S

Volume: $\Delta S = nR\ln \frac{V_{2}}{V_{1}}$
Temperature: $\Delta S = nC\ln \frac{T_{2}}{T_{1}}$

marcus lin 1E
Posts: 54
Joined: Fri Sep 28, 2018 12:28 am

### calculating delta S

why is (V2/V1) equal to (P1/P2)?

Sean Reyes 1J
Posts: 67
Joined: Fri Sep 28, 2018 12:24 am

### Re: calculating delta S

You can set P1V1 = P2V2 according to the Boyle’s Law, and then from there you can just divide out, which leads to:
P1/P2 = V2/V1

Samantha Ito 2E
Posts: 64
Joined: Fri Sep 28, 2018 12:29 am

### Re: calculating delta S

Boyle's Law states that P1V1=P2V2 and by rearranging the equation, you are left with V2/V1 = P1/P2.

Catly Do 2E
Posts: 64
Joined: Fri Sep 28, 2018 12:24 am

### Re: calculating delta S

Using the ideal gas law, or Boyle's law, where PV=nRT, P and V are inversely proportional which is why V2/V1=P1/P2.

Diana Bibireata 1B
Posts: 60
Joined: Fri Sep 28, 2018 12:23 am

### Re: calculating delta S

Pressure and volume are inversely proportional so (P1/P2) = (V2/V1).