5/18/2004H133 Spring 20041Chapter 4•We have spent some time developing the model of ideal gases and have learned a number of important concepts. However, we still have not learned much regarding why certain processes are irreversible.We are getting closer to that “holy grail”. But we need to define some more terms•In this chapter we go through all these points and by the end we will have all the pieces to understand why some processes are irreversible.•Macrostate:We defined this earlier for an ideal gasMost (not all) combinations of three of the following served to describe the macroscopic properties of an ideal gas:oU, T, P, V, N, M, along with the composition.For other things like liquid and solids we will have a similar set of variables that define the macroscopic state of the substance.When we define an Einstein Solidin a few minutes we will see that we can use the internal energy U and the number of molecules, N to define the state.
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