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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

See also[edit]


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