Second law of thermodynamics, equation. This law states that the entropy (dS) of an isolated system not in equilibrium will tend to increase over time, approaching a maximum value at equilibrium. Entropy is a physics term to describe the amount of disorder in a system. When applied to the formula, it means that energy in the universe is gradually moving towards disorder. In simple terms, the second law of thermodynamics can describe how heat can flow from a hotter (high entropy) to a colder body (low entropy) but not the reverse. In 1824, the French physicist Sadi Carnot, first published these ideas by observing and measuring how steam engines operated.
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