Discussion
The slope of a Mollier diagram at constant pressure indicates
Answer: D
The slope of a constant-pressure line on the Mollier diagram is the temperature.
The Mollier diagram plots enthalpy h against entropy s. From the Gibbs relation \(dh = T\,ds + v\,dp\), at constant pressure \(dp = 0\), so
\[ \left(\frac{\partial h}{\partial s}\right)_{p} = T \]
That is why isobars in the wet region are straight lines (the temperature is constant there) and curve upward in the superheated region as the temperature rises.
Enthalpy and entropy are the axes of the diagram, not a slope, and internal energy does not appear in this derivative.
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