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http://www-solar.mcs.st-and.ac.uk/~alan/sun_course/Chapter2/node3.html#energy

[tex]

\frac{\rho^\gamma}{\gamma-1}\frac{D}{Dt}\left(\frac{p}{\rho^\gamma}\right)=-L

[/tex]

I know it in a different format:

[tex]

\frac{dp}{dt}+\gamma p\nabla\cdot\mathbf{v}=-L

[/tex]

Where is the difference coming from?