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1. At a pressure of 2 KG (absolute pressure), the saturation temperature of water vapor is 120 degrees. If, under this pressure, 150-degree superheated steam turns into water at 80 degrees as it releases heat, is the process 150-degree superheated steam – 120-degree saturated steam – 120-degree water – 80-degree water? If you want to turn 150-degree superheated steam into water at 110 degrees, you need to maintain a pressure of 1.4 KG (absolute pressure). In other words, the temperature at which steam turns into water is related to the pressure present; is that correct? 2. What value should the K value be when exchanging heat with water vapor and water? Does this depend on the situation? In one case, when water vapor cools down, it remains water vapor with no phase change – in such a case, what value should be used for K? One method is for water vapor to undergo a phase change and eventually turn into a liquid state; in that case, what value should the K value be? There’s another question: how can I determine whether water vapor is in gaseous or liquid state at the end, and whether a phase change has occurred? It depends on by how much the temperature of the water needs to be increased. If the temperature rises significantly, water vapor releases a lot of heat, and as a result it may turn into a liquid state; if less heat is released, it may remain in a gaseous state. But how exactly is it calculated, and how is it determined?