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There are two main factors that make ocean water more or less dense than about 1027 kg/m3: the temperature of the water and the salinity of the water. Ocean water gets more dense as temperature goes down. So, the colder the water, the more dense it is. Increasing salinity also increases the density of sea water.
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AlexFray555
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The temperature of the water and the saltiness or salinity of the water will determine the ocean's density. The colder the water, the denser it is. Salinity will also increase the density of ocean water.

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