ehrenfest
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Homework Statement
http://en.wikipedia.org/wiki/Maxwell_relations
I am confused about the subscripts next to the partial derivatives.
\left(\frac{\partial T}{\partial V}\right)_S =<br /> -\left(\frac{\partial p}{\partial S}\right)_V\qquad=<br /> \frac{\partial^2 U }{\partial S \partial V}
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?