In the previous lesson, we derived the following two forms of the 1st and 2nd
Gibbs Equationsfor ideal gases.
1st Gibbs Equation (Ideal Gas)
2nd Gibbs Equation (Ideal Gas)
In this lesson, we will apply these equations to
isentropicprocesses. This will lead us to define the
relative pressure, Vr and Pr. These functions are tabulated along with So in the
Ideal Gas Entropy Tablesfor some common gases.
Then, we will consider special
isentropicprocesses in which the
heat capacitiesof our ideal gases are constant. This will lead to three helpful relationships between P, V and T.
Finally, we turn our attention to
polytropicprocesses. These processes can include
irreversibleprocesses as well as systems that contain real fluids as well as ideal gases. We will find that an
isentropicprocess on an ideal gas with constant heat capacities is a special case of the more general
polytropicprocess. We will also see that
isochoricprocesses can also be considered to be special cases of the
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