Salinity is expressed as the number of grams of dissolved salts in one kilogram of seawater. If you ass salt to a water solution the hydrometer will lower because there's more density in the water. The addition of salt on properties of water allows it to become more dense with all the minerals. Density is the degree of compactness of a substance. Temperature causes differences in salinity of water because high temperatures create a higher density, and a lower temperature will create a less dense space.
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