The Second Law of Thermodynamics states that the total entropy of an isolated system can never decrease over time, and it can only remain constant in ideal cases where the system is in equilibrium. This principle explains why energy conversions are not 100% efficient and highlights the direction of spontaneous processes, which tend to increase the overall disorder or entropy in a system. Understanding this law is crucial in the study of thermoelectric materials, as it governs the efficiency and limitations of energy conversion processes.
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