Hydrogen and Helium-4 in thermodynamic equilibrium

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SUMMARY

In thermodynamic equilibrium, the proportion of hydrogen to helium-4 is approximately 75% hydrogen and 25% helium-4, as derived from the proton-proton chain reaction. This ratio reflects the fusion process where hydrogen fuses into helium, with no significant reverse processes occurring. In nuclear statistical equilibrium, the composition would predominantly consist of iron, indicating a shift in elemental abundance under extreme conditions.

PREREQUISITES
  • Understanding of thermodynamic equilibrium concepts
  • Familiarity with nuclear fusion processes, specifically the proton-proton chain reaction
  • Knowledge of nuclear statistical equilibrium principles
  • Basic grasp of elemental composition in astrophysical contexts
NEXT STEPS
  • Research the proton-proton chain reaction in stellar environments
  • Study the implications of nuclear statistical equilibrium in stellar evolution
  • Explore the processes leading to iron dominance in supernova nucleosynthesis
  • Investigate the role of thermodynamic equilibrium in astrophysics
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Astronomers, astrophysicists, and students studying stellar evolution and nuclear processes in stars.

TrickyDicky
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In thermodynamical equilibrium what would be the proportion of hydrogen to helium-4? According to the proton-proton chain branch I it would seem that the equilibrium would be 75% H-25% He-4? is this correct? (This is of course an unrealistic scenario).
 
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TrickyDicky said:
In thermodynamical equilibrium what would be the proportion of hydrogen to helium-4? According to the proton-proton chain branch I it would seem that the equilibrium would be 75% H-25% He-4? is this correct? (This is of course an unrealistic scenario).

In nuclear statistical equilibrium, everything would be iron. P-P causes hydrogen to fuse into helium, but there aren't any significant processes going the other way.
 

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