Ch 7 - Entropy
Here we present a discussion of the
Clausius Inequality
as it applies to reversible and irreversible processes.In this lesson, we define
entropy
, show how to obtain entropy data from theNIST WebBook
and introduce an important new phase diagram: theTS Diagram
. We show how and why the TS Diagram is particularly useful for the analysis ofthermodynamic cycles
.We use the
Clausius Inequality
and the definition ofentropy
to set the stage for the introduction ofentropy 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 thePrinciple of Increasing Entropy
is true: Theentropy of the universe
cannot 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 volume
andrelative pressure
. Then we discussisentropic
processes on ideal gases in which the heat capacities are constant. This turns out to be a special case of the more generalpolytropic process
. We then show how to calculate the boundary work for polytropic processes in closed systems. We conclude by showing thatan isentropic compression
of 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
- The lessons in Chapter 7 are listed below
- Roll your mouse over the lesson title to see a brief description of the contents of the lesson
- Click on the lesson that you want to study
- Click the "Jump to New Page" link here or in the navigation panel on the right to
jump to a different chapter