In my astrophysics book, it says it's [tex]\bar{P}=-\frac{1}{3}\frac{E_{gr}}{V}[/tex](adsbygoogle = window.adsbygoogle || []).push({});

This Wikipedia article has a different equation. http://en.wikipedia.org/wiki/Virial_theorem

Can someone explain the difference?

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# Virial Theorem

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