# Isothermal Compressibility of Photon Gas

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1. Oct 25, 2015

### fricke

I am really stuck at this question.

I tried to get the equation of volume with independent variables P and T, but the equation itself does not give a nice form, and thus I cannot get the derivative of V with respect to P. What should I do?

2. Oct 25, 2015

### Staff: Mentor

What is the non-nice equation you got?