Is This Thermodynamic Relationship Correct?

In summary, the relation T(∂p/∂T)v,N +(∂T/∂V)u,N =p(∂T/∂U)v,N is being discussed, where p= pressure, V= volume, U=internal energy, T= Temperature. The conversation involves attempting to prove this relationship using the fundamental relation and Maxwell's relation, but encountering difficulties. It is suggested to use the term "advanced" to specify the partial derivatives and to clarify which variables are kept constant when taking the derivatives. The importance of considering specific variables in thermodynamics is also mentioned. One participant questions the validity of the relationship due to its inconsistent dimensions.
  • #1
hasibme2k
3
0
How can I prove the following relation
T(∂p/∂T)v,N +(∂T/∂V)u,N =p(∂T/∂U)v,N

where p= pressure, V= volume, U=internal energy, T= Temperature. I tried by fundamental relation and Maxwell's relation but couldn't able to prove it.

I would appreciate if anybody helps me out.
 
Last edited:
Physics news on Phys.org
  • #2
Are those partial derivatives? If so use "advanced" so we can be sure. Is t the same as T?
 
  • #3
...and you also need to tell which variables are kept constant when taking the partial derivatives like in, e.g.,
[tex]C_V=\left (\frac{\partial U}{\partial T} \right )_{V,N}[/tex]
to define the specific heat at constant volume.
 
  • #4
That's the trick with thermodynamics. Partial derivatives always come from maths with something extra: which variables specifically you are keeping constant when calculating the limits of a multivariable function.
 
  • #5
I think the relationship is wrong. The dimensions of the first term are those of pressure, but the dimensions of the other two terms are those of temperature divided by volume.
 

FAQ: Is This Thermodynamic Relationship Correct?

What is Maxwell's relation in thermodynamics?

Maxwell's relation is a set of four equations in thermodynamics that relate different thermodynamic properties of a system, such as temperature, pressure, and volume. These equations are derived from the laws of thermodynamics and are used to better understand and analyze the behavior of thermodynamic systems.

How are Maxwell's equations derived?

Maxwell's equations are derived from the first and second laws of thermodynamics, using mathematical manipulations and substitutions. They are based on the concept of thermodynamic potentials, which are functions that describe the state of a thermodynamic system.

What are the four Maxwell's equations in thermodynamics?

The four Maxwell's equations are:

  1. ∂S/∂V = (∂P/∂T)S
  2. ∂S/∂T = (∂P/∂V)T
  3. ∂S/∂V = - (∂u/∂T)V
  4. ∂S/∂T = (∂u/∂V)T

where S is entropy, V is volume, P is pressure, T is temperature, and u is internal energy.

What is the significance of Maxwell's equations in thermodynamics?

Maxwell's equations are important in thermodynamics because they provide a way to understand and relate different thermodynamic properties of a system. They also help in the derivation of other thermodynamic relations and equations, and are used in various thermodynamic calculations and analyses.

Can Maxwell's equations be applied to all thermodynamic systems?

Yes, Maxwell's equations can be applied to all thermodynamic systems, as long as they follow the laws of thermodynamics. They are particularly useful in systems that are in a state of thermodynamic equilibrium, where all the properties of the system are constant and unchanging. They can also be applied to non-equilibrium systems, but with some modifications.

Back
Top