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EMA_4314_HW2_solutions - EMA 4314 HW 2 Solutions Discussion...

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EMA 4314 HW 2 Solutions Discussion Questions 2.2 Rewrite the two expressions as follows: (1) adiabatic p 1/ V Ȗ (2) isothermal p 1/ V The physical reason for the difference is that, in the isothermal expansion, energy flows into the system as heat and maintains the temperature despite the fact that energy is lost as work, whereas in the adiabatic case, where no heat flows into the system, the temperature must fall as the system does work. Therefore, the pressure must fall faster in the adiabatic process than in the isothermal case. Mathematically, this corresponds to Ȗ > 1. 2.4 The change in a state function is independent of the path taken between the initial and final states; hence for the calculation of the change in that function, any convenient path may be chosen. This may greatly simplify the computation involved and illustrates the power of thermodynamics. The following list includes only those state functions that we have encountered in the first two chapters. More will be encountered in later chapters.
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