When dense brine is evaporated in vacuum evaporation vessel for salt production, water evaporates. That vapor fills up the vacuum. Then how vacuum in the vessel is maintained constantly?
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Vacuum evaporation is the process of causing the pressure in a liquid-filled container to be reduced below the vapor pressure of the liquid, causing the liquid to evaporate at a lower temperature than normal. Although the process can be applied to any type of liquid at any vapor pressure, it is generally used to describe the boiling of water by lowering the container's internal pressure below standard atmospheric pressure and causing the water to boil at room temperature.
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