Statistical Mechanics: particle density of an atmosphere

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SUMMARY

The discussion focuses on calculating the particle density in Earth's atmosphere using statistical mechanics, specifically the grand canonical ensemble. The key equations referenced include the Boltzmann distribution and the ideal gas law. It is established that knowing the pressure (1 atmosphere) and temperature allows for the use of the ideal gas equation, simplifying the problem without requiring the number of particles (N). The conclusion emphasizes that the grand canonical ensemble is unnecessary for this specific calculation.

PREREQUISITES
  • Understanding of statistical mechanics concepts, particularly the grand canonical ensemble
  • Familiarity with the Boltzmann distribution and its applications
  • Knowledge of the ideal gas law and its implications in thermodynamics
  • Basic principles of atmospheric physics, including pressure and temperature relationships
NEXT STEPS
  • Study the derivation and applications of the ideal gas law in various conditions
  • Explore the grand canonical ensemble and its relevance in statistical mechanics
  • Learn about the Boltzmann distribution in detail, including its derivation and applications
  • Investigate atmospheric pressure variations and their effects on particle density
USEFUL FOR

Students and researchers in physics, particularly those studying statistical mechanics, thermodynamics, and atmospheric science. This discussion is beneficial for anyone looking to understand the relationship between particle density, pressure, and temperature in gaseous systems.

bjb406
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Homework Statement


I am supposed use stat mech to find the particle density in Earth's atmosphere given only the particle mass, and temperature, and the planet's mass I guess. And I don't really know where to begin. Obviously I need to use the grand canonical ensemble but I don't know where to start without knowing the number of particles in the system.

Homework Equations


Boltzmann distribution I guess? n(r) = A*e^(-(βρ^2)/(2m))*e^(-βmgr)


The Attempt at a Solution


I don't know what to do without knowing N
 
Physics news on Phys.org
Well if you're given the pressure (1 atmosphere?) and the temperature, you can just go ahead and use the ideal gas equation. No fancy grand canonical stuff required! :smile:
 

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