![]() ![]() It was first identified by physical scientists in the 19th century and acted as a guiding principle for many of the Industrial Revolution’s revolutionary technologies. However, the entropic quantity we have defined is very useful in defining whether a given reaction will occur. Entropy is a vague yet powerful term that forms that backbone of many key ideas in Thermodynamics and Information Theory. Because work is obtained from ordered molecular motion, the amount of entropy is also a measure of the molecular disorder, or randomness, of a system. The entropy balance is easier to apply that energy balance, since unlike energy (which has many forms such as heat and work) entropy has only one form. It is evident from our experience that ice melts, iron rusts, and gases mix together. entropy, the measure of a system’s thermal energy per unit temperature that is unavailable for doing useful work. ![]() ![]() This apparent discrepancy in the entropy change between an irreversible and a reversible process becomes clear when considering the changes in entropy of the surrounding and system, as described in the second law of thermodynamics. ![]()
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