Understanding Virial Theorem: Comparing Equations

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SUMMARY

The discussion centers on the differences between two formulations of the Virial Theorem as presented in an astrophysics book and a Wikipedia article. The book states the equation as \(\bar{P}=-\frac{1}{3}\frac{E_{gr}}{V}\), focusing on pressure and volume, while the Wikipedia article emphasizes kinetic and potential energy along with the concept of "virial." Both formulations ultimately describe the same physical principles, despite the differing variables used.

PREREQUISITES
  • Understanding of the Virial Theorem in astrophysics
  • Familiarity with concepts of pressure, volume, kinetic energy, and potential energy
  • Basic knowledge of mathematical notation used in physics
  • Ability to interpret scientific literature and equations
NEXT STEPS
  • Research the derivation of the Virial Theorem in classical mechanics
  • Explore the applications of the Virial Theorem in astrophysics
  • Study the relationship between kinetic and potential energy in gravitational systems
  • Examine various formulations of the Virial Theorem across different scientific sources
USEFUL FOR

Students and professionals in astrophysics, physicists studying gravitational systems, and anyone interested in the mathematical foundations of the Virial Theorem.

Stratosphere
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In my astrophysics book, it says it's \bar{P}=-\frac{1}{3}\frac{E_{gr}}{V}

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

Can someone explain the difference?
 
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Stratosphere said:
In my astrophysics book, it says it's \bar{P}=-\frac{1}{3}\frac{E_{gr}}{V}

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

Can someone explain the difference?

Yes; the variables being used are different. Your formula is using pressure and volume. Wikipedia is using kinetic and potential energy, and the "virial". Should work out to be the same, I think.

Cheers -- sylas
 

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