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How to Measure the Salinity of Sea Water

Salt water that contains sea life must contain an appropriate amount of saline---about 32 to 37 parts per thousand---in order to sustain its ecosystem. The salt level can change based on how much water evaporates. For example, if too much water in an enclosed container is allowed to evaporate, the saline level goes up dramatically. You can easily measure the salinity of sea/ocean water using an instrument called a refractometer or salinity refractometer, which measures the index of refraction of a particular substance. It is a device used in geology, medicine and agriculture.


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