• Support PF! Buy your school textbooks, materials and every day products Here!

Pressure, volume and temperature in thermodynamics

  • Thread starter pivoxa15
  • Start date
  • #1
2,255
1
It seems there are 3 variables that are important for a particular state in thermodynamics, pressure, volume and temperture. For a state function like energy U, I can choose any two variables of the three above and do partial differentiations with it? So the two I choose is arbitary in order to work out quantities like heat capcity and the like.
 

Answers and Replies

  • #2
AlephZero
Science Advisor
Homework Helper
6,994
291
Yes - that's why two different specific heats (Cp and Cv) are defined and used. Of course Cp and Cv are related to each other, because, as you said, they are both consistent with the same equations of state of the material.

For example in a situation where the pressure is constant, it is obviously easier to write equations use Cp, rather than to use Cv and have extra terms in the equations because the volume is not constant.
 

Related Threads on Pressure, volume and temperature in thermodynamics

  • Last Post
Replies
1
Views
457
Replies
1
Views
3K
  • Last Post
Replies
4
Views
6K
  • Last Post
Replies
0
Views
1K
Replies
10
Views
1K
  • Last Post
Replies
0
Views
927
Replies
1
Views
6K
Replies
3
Views
3K
Replies
1
Views
2K
  • Last Post
Replies
2
Views
1K
Top