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Finally, using the definition of t and Form D of the First Law [I.C.12], we can construct a Conservative Form of the First Law of Thermodynamics, tt + (tv) = 0, [Equation I.C.14] which may replace the adiabatic form of the First Law in our set of principal governing equations.
The principle that energy can neither be created nor be destroyed, now part of the first law of thermodynamics. The term is also used as a synonym for the first law of thermodynamics. See Note at thermodynamics.