# Entropy - explanation

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Describe what entropy is and give its statistical and classical definition.

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Entropy is a measure of disorder of a system and naturally arises from the second law of thermodynamics. It has a basis in classical and statistical thermodynamics.

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ENTROPY

Entropy is a measure of disorder of a system and naturally arises from the second law of thermodynamics. It has a basis in classical and statistical thermodynamics.

In classical thermodynamics, the second law states that no process is possible whose only effect is the complete conversion of heat into work (Kelvin's formulation) or equivalently no process is possible whose only effect is to transfer heat from a hotter to colder body (Clausius' formulation). This leads to the idea of a Carnot cycle whereby dQ/T <=0, where equality holds ...

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