## Understanding Equation Form

Hi,

Example:

Maxwell Relation (thermoD)...

($\frac{∂μ}{∂T}$)$_{p,n}$ = - ($\frac{∂S}{∂n}$)$_{T,p}$

what does it mean having those subscript variables outside of the brackets.

thanks

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 Mentor They are kept constant in the process. For example, the left side is the change of µ if you change T, but keep p and n constant.
 post#2 of http://www.physicsforums.com/showthread.php?t=666011 gives an example of the use of this for deriving one of Maxwells relations Have you studied partial differentiation?