Effusion Physics Problem: Calculating Final Temperature of Gas in a Vessel

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SUMMARY

The discussion centers on calculating the final temperature (Tf) of gas in a vessel after effusion through a small hole into a vacuum. The user derived the mean kinetic energy of the effused molecules as 2kT and proposed that Tf can be expressed as Tf = p/nk, where p is the pressure and n is the number of moles. The conclusion drawn is that Tf equals 4/3 T, indicating a definitive relationship between the initial temperature and the final temperature of the gas after effusion.

PREREQUISITES
  • Understanding of Maxwellian distribution of speeds in gases
  • Knowledge of kinetic theory of gases
  • Familiarity with the ideal gas law
  • Basic principles of thermodynamics
NEXT STEPS
  • Study the derivation of the Maxwell-Boltzmann distribution
  • Learn about the kinetic theory of gases and its applications
  • Explore the ideal gas law and its implications in thermodynamic processes
  • Investigate the effects of effusion on gas properties and temperature changes
USEFUL FOR

This discussion is beneficial for physics students, particularly those studying thermodynamics and kinetic theory, as well as educators seeking to clarify concepts related to gas behavior during effusion.

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Homework Statement



A vessel contains gas at temp T (monatomic). Maxwellian distribution of speeds.

Molecules diffuse via small hole into vacuum. Box opened for short time and catches some molecules. Calc. final temp of gas in box.

Homework Equations





The Attempt at a Solution



So i worked out mean ke of effused molecules to be 2kT

Let Tf be temp of gas in box

can i then just say Tf = p/nk

But p = 1/2 n m <v^2>

Therefore, using my result, Tf = 4/3 T? Is this right?
 
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