The main topic of the 2nd law of thermodynamics deals with the a property called entropy. After learning the Clausius Inequality we are able to derive the entropy and use it to solve many problems such as why the heat flows from high temperature to low temperature.

The objectives of this item Entropy are to:

- Definition of Entropy: https://thermodynamics-engineer.com/definition-of-entropy/
- Isentropic Relation: https://thermodynamics-engineer.com/isentropic-relations/
- The Entropy Change of Ideal Gases: https://thermodynamics-engineer.com/the-entropy-change-of-ideal-gases/
- The Increase of Entropy Change: https://thermodynamics-engineer.com/the-increase-of-entropy-change/