Second Law of Thermodynamics
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May 1, 2024
Updated May 11, 2025
18 minute read
The Second Law of Thermodynamics is a fundamental principle of physics with profound implications, describing the natural tendency of systems to evolve towards a state of greater disorder or randomness. At its core, it introduces the concept of entropy, a measure of this disorder, and posits that the total entropy of an isolated system can only increase over time or remain constant in idealized cases where the system is in a steady state or undergoing a reversible process. This law governs the direction of spontaneous processes, explaining why heat flows from hot to cold objects, why gases expand to fill their containers, and ultimately, why energy transformations are never perfectly efficient.
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