## Temperature units for Entropy [ENDORSED]

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

siannehazel1B
Posts: 30
Joined: Fri Sep 29, 2017 7:06 am

### Temperature units for Entropy

When solving for entropy when there is a change in temperature while Volume is constant, does it matter if we calculate the T2/T1 in Kelvin or Celcius? If so, which one are we expected to be using?

Janet Nguyen 2H
Posts: 51
Joined: Fri Sep 29, 2017 7:05 am

### Re: Temperature units for Entropy

It does make a difference since the temperatures are being divided you would get different answers for Kelvins vs Celsius. I think you should be using Kelvins but Im not sure why. might be in the derivation of the formula!

RyanS2J
Posts: 32
Joined: Thu Jul 27, 2017 3:00 am

### Re: Temperature units for Entropy  [ENDORSED]

It matters, since calculating in Kelvin versus in Celsius gives you different values for the natural log. Entropy should be calculated using Kelvin.