- #1
ehrenfest
- 2,020
- 1
Homework Statement
http://en.wikipedia.org/wiki/Maxwell_relations
I am confused about the subscripts next to the partial derivatives.
[tex] \left(\frac{\partial T}{\partial V}\right)_S =
-\left(\frac{\partial p}{\partial S}\right)_V\qquad=
\frac{\partial^2 U }{\partial S \partial V}[/tex]
What does the S mean after the first partial? Does it mean that this equation is only true when entropy is held constant? I thought the point of a partial derivative was to hold constant all other quantities except the one that you differentiate w.r.t?