Deriving an Thermodynamic Equation of State

Duy028
Messages
2
Reaction score
0

Homework Statement



Derive the following:

\left(\frac{\partial U}{\partial V}\right)_{T}=T\left(\frac{\partial p}{\partial T}\right)_{V}-p

Homework Equations



Use the partner equation:

\left(\frac{\partial H}{\partial p}\right)_{T}=-T\left(\frac{\partial V}{\partial T}\right)_{p}+V

The Attempt at a Solution



I just need help finding the derivation. All the links I've searched for so far lead me to other derivations that use these equations to derive other ones. Obviously, it's hard to google things with partial derivatives in it. Any help would be useful. Thanks!
 
Physics news on Phys.org
Hi Duy028, welcome to PF!:smile:

Duy028 said:
I just need help finding the derivation. All the links I've searched for so far lead me to other derivations that use these equations to derive other ones. Obviously, it's hard to google things with partial derivatives in it. Any help would be useful. Thanks!

We don't do your homework for you here, and we don't post links to solutions for your homework either.

Try the derivation yourself, and we'll help you through it where you get stuck. As a starting point, how is U defined (1st Law)? How is H defined?
 
Thanks anyways, but I slept on it and woke up having a clearer mind and found the solution. I'll be sure to be back if I have other problems and will remember to post my attempts.
 
To solve this, I first used the units to work out that a= m* a/m, i.e. t=z/λ. This would allow you to determine the time duration within an interval section by section and then add this to the previous ones to obtain the age of the respective layer. However, this would require a constant thickness per year for each interval. However, since this is most likely not the case, my next consideration was that the age must be the integral of a 1/λ(z) function, which I cannot model.
Back
Top