Discussion
State whether the following is true or false.
Enthalpy is an absolute quantity that can be measured directly.
Answer: B
Correct answer: False
Only enthalpy *changes* are measurable; the absolute value depends on an arbitrary reference state, so tables quote enthalpy relative to a chosen datum such as liquid water at the triple point. That is not a limitation in practice, because every energy balance involves a difference and the datum cancels - provided the same datum is used throughout.
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