Entropy is a specific process in thermodynamic system, where it is used for representing a lack in the thermal energy of the concerned system while it is being converted to mechanical energy. In this case, the whole system functions within a certain sense of randomness, and therefore the associated process has to function in that level.

The entropy changes and becomes of the higher levels when it is placed in a secluded system and it is taken to be maximum at the equilibrium point. When there is a total change in entropy, there is enclosing adiabatic surroundings which is zero or at the higher level.

For (a) & (c) cycle
(for a & c irreversible cycle) … (8.14)
From equation (8.13) & (8.14) we can write

(as b is reversible)

(as entropy change is same in band c)

Thus it is proved that the entropy of an isolated system always increases, it can never decrease.

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:-

• 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

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