Rapid cooling of reactor contents from 140°C down to 120°C by evaporation of pressurized water.
Every liquid begins to boil when it's vapour pressure reaches the pressure of the surrounding. We usually observe this while heating liquids. The temperature rises up to the boiling point, where the vapour pressure equals atmospheric pressure and boiling (evaporation in whole volume of liquid, not only from the surface) occurs. If however we would not allow vapour to escape, the temperature will go h
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