Salinity

Author:Think Fish Last updated: 21 June 2013 19:07

A term used to measure the amount of dissolved salt in water. Seawater usually has a salinity of around 35 ppt (parts per thousand) whilst pure freshwater has a salinity of zero. Measurements can vary depending on the method of measuring as well as the temperature of the water. In marine aquariums a hydrometer, which measures specific gravity, is usually used as a method of measuring salinity

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