In the previous post, I talked about the second law of thermodynamics: there can be do thermodynamic transformation whose overall effect is to move heat from a cooler body to a hotter one. Since the *reverse* of such a transformation (moving heat from a hotter body to a cooler one) happens naturally by conduction, the second law naturally contains an element of *irreversibility* which it is natural to expect is expressed by an *inequality*. The quantity to which this applies is the famous **entropy**.

# Thermodynamics IV: entropy

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