Answer: Seawater is a complex mixture of 96.5 percent water, 2.5 percent salts, and smaller amounts of other substances, including dissolved inorganic and organic materials, particulates, and a few atmospheric gases.The physical properties of seawater–temperature, salinity, pressure, density, and related quantities such as potential density, heat capacity, sound speed, and others–aSalt water or seawater has characteristics similar to fresh water with some noticeable differences because of the salts that are dissolved in water. The viscosity (i.e., internal resistance to flow) of seawater, for example, is higher than that of fresh water because of its higher salinity.re of fundamental importance to physical oceanography.
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