Relationship between single particle partition function and V

In summary, the single particle partition function is directly proportional to the volume of the system when the particles are nonlocalized, but independent of V when the particles are localized. This is because when a particle is localized, its position is fixed and does not depend on the volume of the system. However, when a particle is nonlocalized, it can be viewed as a wave function with multiple possible locations, and the number of these locations is determined by the dimensions of the container, or the volume of the system.
  • #1
hokhani
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Why when the particles are nonlocalized, the single particle partition function is directly proportional to V, namely the volume of the system, and when the particles are localized, the single particle partition function is independent of V? (Pathria, Statistical Mechanics, chapter 4, section 4.4, equations 2&14)
 
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  • #2
when a particle is localized, then, well, they're localized, so no need to worry about the entire volume. but when a particle isn't localized, you have to invoke quantum mechanics and view the particles as wave functions (probability wave). we view this wave function as a standing wave and the number of antinodes in a given space would be the number of possible locations at which this 'particle' can be at. and the number of antinodes is determined by the dimensions of the container these particle can be in (the volume)
 
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1. What is the single particle partition function?

The single particle partition function is a mathematical quantity used in statistical mechanics to describe the distribution of particles in a system. It takes into account the energy levels and degeneracy of a single particle in a given energy state.

2. How is the single particle partition function related to V (volume)?

The single particle partition function is directly proportional to the volume of the system. As the volume increases, the number of available energy states for the particle also increases, leading to a larger partition function.

3. What is the significance of the relationship between single particle partition function and V?

The relationship between the single particle partition function and the volume of a system plays a crucial role in determining the thermodynamic properties of the system. It allows us to calculate the entropy, free energy, and other thermodynamic quantities.

4. Can the relationship between single particle partition function and V be applied to all systems?

Yes, the relationship between single particle partition function and V can be applied to any system, regardless of its size or complexity. It is a fundamental concept in statistical mechanics and is used to study various physical systems, such as gases, liquids, and solids.

5. How do fluctuations in volume affect the single particle partition function?

Fluctuations in volume can affect the single particle partition function by changing the available energy states for the particle. This, in turn, can alter the thermodynamic properties of the system, such as temperature and pressure.

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