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===Thermodynamic entropy===
The concept of [[Entropy (classical thermodynamics)|thermodynamic entropy]] arises from the [[second law of thermodynamics]]. This law of entropy increase quantifies the reduction in the capacity of a system for change or determines whether a thermodynamic process may occur. For example, heat always flows from a region of higher temperature to one with lower temperature until temperature becomes uniform.
Thermodynamic entropy is only measured as a change in entropy (<math>\Delta S</math>) to a system containing a sub-system which undergoes heat transfer to its surroundings (inside the system of interest). It is based on the [[macroscopic]] relationship between [[heat flow]] into the sub-system and the temperature at which it occurs summed over the boundary of that sub-system.
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