The concept of entropy as a physical attribute of a thermodynamic system is established by the second law of thermodynamics. Despite following the necessity of energy conservation as specified in the first law of thermodynamics, entropy predicts the direction of spontaneous processes and determines whether they are irreversible or impossible. Second law of thermodynamics states that the change in entropy (dS) is defined as the ratio of the heat transfer (dQ) into the system and the temperature (T).