Do Path-Dependent Processes Affect Thermodynamic Quantities in Ideal Gases?

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SUMMARY

The discussion focuses on the thermodynamic analysis of an ideal gas transitioning from a state of P=32, V=1 to P=1, V=8 through three distinct paths: first pressure then volume, first volume then pressure, and adiabatically. The heat change for the adiabatic process is established as zero, while the work done is calculated for the other two paths, specifically during volume changes. The internal energy change is confirmed to be consistent across all paths, emphasizing the importance of understanding the equations governing these processes, such as W_{1 \rightarrow 2} = ∫_{V_1}^{V_2} p\, dV and the adiabatic condition pV^\gamma = constant.

PREREQUISITES
  • Understanding of the Ideal Gas Law
  • Familiarity with thermodynamic equations, particularly work and heat transfer
  • Knowledge of adiabatic processes and their characteristics
  • Basic calculus for evaluating integrals in thermodynamic contexts
NEXT STEPS
  • Study the Ideal Gas Law and its applications in thermodynamics
  • Learn about the derivation and implications of the adiabatic process equations
  • Explore the relationship between work, heat, and internal energy in thermodynamic systems
  • Investigate the implications of path-dependence in thermodynamic processes
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This discussion is beneficial for students and professionals in physics and engineering, particularly those specializing in thermodynamics, as well as anyone interested in the behavior of ideal gases under varying conditions.

painfive
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An ideal gas changes state from P=32, V=1 to P=1 V=8 via three different paths: first pressure then volume, first volume then pressure, and adiabatically. I need to calculate the change in heat energy, work done by the system, and change in internal energy for all three paths. Will these be the same for all the paths? What equations should I use? So far I found the heat change for the adiabatic system (zero) and the work done by the other two (only along the parts where the volume changes). I'm pretty sure the internal energy change is the same for all of them, so I need at least one more value before I can get the rest.
 
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first pressure then volume, first (second?) volume then pressure, and adiabatically.

Does first pressure then volume mean first pressure changes (decreases) and then volume changes (increases)?

How about showing some equations.

e.g. [itex]W_{1 \rightarrow 2} = \int_{V_1}^{V_2} p\, dV[/itex]

and for an adiabatic system [itex]pV^\gamma = const[/itex]

and what is the relationship between energy and work in the gas?
 
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