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Given two points $(P,T, H_{mix})$, how can I interpolate $H_{mix}$ between them?
In other words, if I had two points $(H_1, P_1, T_1)$ and $(H_2, P_2, T_2)$, where $H_{mix}$ is the enthalpy of mixing, $P$ is the pressure and $T$ is the temperature, how would I interpolate between them? I started...