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What is the boiling point of water in space? Replies: The boiling point of water is fixed by its temperature, and the vapor pressure of water at that temperature. So for example, if the water is at 100 C. the boiling point is 100 C. at a pressure of 1 atm (which is equal to 760 mm of Hg).
Because the pressure drops in the throttling device and the feed is a superheated vapor, the effluent must also be a superheated vapor. So, to answer part (a), we must use the Superheated Steam Tables to determine the temperature of 400 kPa steam that has a specific enthalpy equal to H2.