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 Nov 24 awarded Supporter Nov 24 comment 2 streams going into an engine and 2 come out. Find the enthalpy? You seem to have made some typos in the question, but my first guess anyways is that you've made a mistake with the units on $\tfrac{v^2}{2}$: $1 \tfrac{\text{m}^2}{\text{s}^2}$=1 J/kg, so if you add it to enthalpies in kJ/kg you'll get a greater outlet enthalpy. Nov 24 comment What type of substances allows the use of the Ideal Gas Law? Wikipedia: Saturated fluid cites Çengel and Boles. Also, just about every steam table calculator I've run across lists boiling-point properties as saturation properties: example. Nov 24 comment What type of substances allows the use of the Ideal Gas Law? The ideal gas law is an equation of state, and some equations of state apply for liquids as well as gases. Besides, strictly speaking, "ideal gas law" wouldn't even suggest that the law could be used for vapors – but it works well for vapors when $P_r<<1$. And a saturated liquid is just a liquid at a temperature where it can boil. There is very little volume change associated with saturated liquid versus subcooled liquid, so the ideal gas law fails equally badly in either case – even though it works better for superheated vapors than for saturated vapors. Nov 24 comment What happens to temperature when pressure is constant in a cylindrical piston of saturated liquid ammonia? Yes, it's in the two-phase region because there are two phases in equilibrium. That means each phase has its own equation of state – or its own unique solution to a single gas-liquid equation of state. It doesn't matter whether this happens above or below $P_c$ – but it cannot happen above $T_c$, because then a liquid cannot form. Nov 24 answered What happens to temperature when pressure is constant in a cylindrical piston of saturated liquid ammonia? Nov 24 awarded Teacher Nov 24 awarded Editor Nov 24 revised What type of substances allows the use of the Ideal Gas Law? added 4 characters in body Nov 24 answered What type of substances allows the use of the Ideal Gas Law?