deletions | additions       diff --git a/untitled.tex b/untitled.tex  index 533c708..3328cb4 100644  --- a/untitled.tex  +++ b/untitled.tex 
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so that  \begin{align}  dQ &= R\left( 1 + \frac{1}{\gamma-1}\right)dT - \frac{d \rho}{\rho} \\  &= \frac{\gamma R}{\gamma-1}dT - \frac{d \rho}{\rho} P}{\rho}  \end{align}  Let's also introduce the enthalpy $h$ in the limit that the number of particles in the system is constant,