Discussion
Steam tables give enthalpy relative to a reference of
Answer: B
Correct answer: saturated water at the triple point
Steam tables set enthalpy and entropy to zero for saturated liquid water at the triple point, 0.01 degrees Celsius. The choice is arbitrary, as any enthalpy datum must be, and it is harmless because every calculation involves a difference in which the datum cancels - provided the same table, or the same datum, is used throughout.
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