How can salinity be measured?
In this experiment, you will create a scientific instrument called a hydrometer. A hydrometer is used to measure the specific gravityThe ratio of the density of a substance to the density of pure water. of water, comparing the density of one water sample to that of pure water. Pure water has a density of 1.000 grams/milliliter. If any salts or chemicals are added, they will dissolve and their added mass will increase the density of the water. This will increase the specific gravity. The greater the specific gravity, the greater the salinity. A hydrometer works on the Archimedes Principle of buoyancy, which states that a liquid exerts an upward buoyant force on…
