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Entropy: Thermodynamics, Disorder, and the Arrow of Time

entropy as a scientific measurement of disorder or the number of ways microscopic particles can be arranged within a system. Primarily used in physics and chemistry, the concept describes how energy becomes unavailable to perform work as systems naturally transition toward more random states. The source outlines essential mathematical formulas and practical examples, such as phase changes where solids melting into liquids represent an increase in entropy. It further explores the Second Law of Thermodynamics, which suggests that the total entropy of the universe is constantly rising, a phenomenon often called the arrow of time. Finally, the article clarifies that while entropy is linked to uncertainty in information theory, its application in physical systems is strictly dependent on whether a system is isolated or open. #entropy #thermaldynamics #mechanicalengineering