# Example of entropy as function of temperature only

Tags:
1. Nov 16, 2015

### hoomanya

Hi, I know that changes in entropy can be expressed as a function of temperature, specific volume, and pressure using the fundamental equations of thermodynamics: ds = du/T+pdv/T, where the changes in entropy can be caused by either changing the specific volume or the internal energy.
I also know that entropy itself can be expressed as s(T,v) or s(U,v) where U is possibly function of T and v itself? I was wondering if anyone knew of examples of where entropy itself, can be assumed to be dependent on temperature alone.

2. Nov 16, 2015

### Dr. Courtney

If entropy is a function of T and v, S(T, v), and v is constant, isn't S then a function of T alone?

3. Nov 16, 2015

### hoomanya

ooops! Thanks!

4. Jan 16, 2016

### hoomanya

Hi again, am I right that s(T) is a valid assumption for most liquids and solid because the intermolacular spacing is constant and hence changes in entropy due to changes in specific volume can be ignored?