# Background: Clausius and Entropy

In the previous lesson, we learned about

#### entropy

, where to find entropy data (NIST WebBook) and#### TS

and#### HS Phase Diagrams

.In this lesson, we will use the

#### Clausius Inequality

and the definition of entropy to define#### entropy generation

.#### Clausius Inequality

:
Integral form of the definition of

#### entropy

:Path A is irreversible and

path B is internally reversible.

path B is internally reversible.

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