= I. A. Waitz
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An engineering educator whose joint teaching text connects the <first law of thermodynamics> with practical energy bookkeeping. The change in stored <internal energy> differs from the <heat> and <work> transferred during a process. Separating a <state function> from transfers across a system boundary helps compare different ways of taking the same material between two states.<Thermodynamics and Propulsion>[§§1.3 and 2.1: transfer mechanisms, stored energy and first-law sign conventions]{ref}
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