Heat
From SklogWiki
The heat, Q is given by
\[\delta Q= TdS\]
where T is the temperature and S is the entropy. \(\delta\) represents an inexact differential, indicating that the resulting value depends on the path taken. This equation is an equality when the process is reversible, i.e., the system evolves through a succession of equilibrium states. If the process is irreversible one has
\[\delta Q < TdS\]
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