Deriving an Thermodynamic Equation of State

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SUMMARY

The forum discussion centers on deriving the thermodynamic equation of state: \(\left(\frac{\partial U}{\partial V}\right)_{T}=T\left(\frac{\partial p}{\partial T}\right)_{V}-p\). Participants emphasize the importance of understanding the definitions of internal energy (U) and enthalpy (H) as per the first law of thermodynamics. The conversation highlights the challenge of searching for resources related to partial derivatives in thermodynamics. Ultimately, the original poster successfully derived the equation after reflection and understanding the concepts involved.

PREREQUISITES
  • Understanding of thermodynamic concepts, specifically internal energy (U) and enthalpy (H).
  • Familiarity with partial derivatives in the context of thermodynamics.
  • Knowledge of the first law of thermodynamics.
  • Basic proficiency in mathematical derivations involving thermodynamic equations.
NEXT STEPS
  • Study the first law of thermodynamics and its implications on internal energy and enthalpy.
  • Learn about the Maxwell relations in thermodynamics for deeper insights into partial derivatives.
  • Explore examples of thermodynamic equations of state and their derivations.
  • Practice solving thermodynamic problems involving partial derivatives to enhance problem-solving skills.
USEFUL FOR

This discussion is beneficial for students in thermodynamics, educators teaching thermodynamic principles, and researchers focusing on thermodynamic equations of state.

Duy028
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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!
 
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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.
 

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