# 3.7 The Fundamental Equation - Tunghai University

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3.7 The Fundamental Equation • First Law of thermodynamics: dU = dq + dw • For a reversible change in a closed system of constant composition, and in the absence of any additional (non-expansion) work, dwrev = −p dV • and from the definition of entropy, dqrev = TdS where p is the pressure of the system and T its temperature.

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