While dealing with laws of Thermodynamics, it is important to note that there are 2 laws associated with it, and certain theorems are explained mathematically. This Clausius Theorem is associated with Second Law of Thermodynamics and is mathematical explanation. This theorem specifically explains relation between entropy of a system and its heat flow in its surroundings.

This inequality feature is applicable to any real engine cycle and places a negative charge on entropy of the cycle itself. It is also notable that entropy that is given to environment during a cycle greater than the entropy that has been transferred by heat to that engine from the hot reservoir.

**8.5.2 Reversible Isothermal Process**

**8.5.3 Carnot Cycle in T -S Plot**

Process 1 – 2 = reversible isothermal

Process 2- 3 = reversible adiabatic T

Process 3 – 4 = reversible isothermal

Process 4-1 = reversible adiabatic

**Links of Previous Main Topic:-**

- Open system and control volume
- Conversion of work into heat
- Introduction to carnot cycle
- Clausius inequality entropy and irreversibility introduction
- Reversible adiabatic paths do not intersect
- Clausius theorem
- Entropy
- Entropy temperature plot
- Clausiuss inequality

**Links of Next Mechanical Engineering Topics:-**

- Entropy change in an irreversible process
- Principle of increase of entropy
- The degree of irreversibility of and irreversible process
- Summary of first and second law by clausius
- Practical use of entropy principle
- First law and second law combined
- Analysis of thermodynamic equations
- Ideal gas or perfect gas
- Introduction about air standard cycles
- Properties of pure substances introduction
- Vapour compression refrigeration cycle introduction
- Basic fluid mechanics and properties of fluids introduction