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定义
度量系统无序或随机程度的热力学量，以焦耳每开尔文（J/K）为单位。
解释
The Second Law of Thermodynamics states that total entropy of an isolated system always increases over time. An ice cube melting in a warm room increases entropy as ordered crystal structure becomes disordered liquid. Entropy also underpins information theory: Claude Shannon borrowed the concept to quantify uncertainty in data, where 1 bit of entropy represents a 50/50 choice.
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