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What is Entropy ?






The first law of thermodynamics was stated in terms of cycles first and it was shown that the cyclic integral of heat is equal to the cyclic integral of work. When the first law was applied for thermodynamic   processes, the existence of a property, the internal energy, was found.

 Similarly, the second law was also   first stated in terms of  cycles executed by a systems. When applied to a processes, the second law also   leads to the definition of  new property, known as entropy. If  the first law is said to be the law of internal   energy, then the second law may be stated to the law of entropy. In fact, thermodynamics is the study of   three E's, namely, energy, equilibrium and entropy. 



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