Ch 7 - Entropy
Here we present a discussion of the
Clausius Inequalityas it applies to reversible and irreversible processes.
In this lesson, we define
entropy, show how to obtain entropy data from the
NIST WebBookand introduce an important new phase diagram: the
TS Diagram. We show how and why the TS Diagram is particularly useful for the analysis of
We use the
Clausius Inequalityand the definition of
entropyto set the stage for the introduction of
entropy generation. We show that the area under an irreversible process path on a TS Diagram is not equal to the heat transferred during the process. We conclude by showing that the
Principle of Increasing Entropyis true: The
entropy of the universecannot decrease.
In this lesson, we derive the
1st and 2nd Gibbs Equations. We show how they can be used to evaluate for processes involving incompressible substances and ideal gases.
In this lesson, we introduce
relative pressure. Then we discuss
isentropicprocesses on ideal gases in which the heat capacities are constant. This turns out to be a special case of the more general
polytropic process. We then show how to calculate the boundary work for polytropic processes in closed systems. We conclude by showing that
an isentropic compressionof an ideal gas requires the least work.
- The Clausius Inequality
- Entropy: A New Property
- The Principle of Increasing Entropy
- Fundamental Property Relationships
- Polytropic and Isentropic Processes
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