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Composition of sea water?
Sodium 30.4%, 3.7% magnesium, calcium 1.2%, 1.1% potassium, 0.04% strontium, chlorine 55.2%, 7.7% sulfate, 1.19% bromine, carbonate and bicarbonate 0.35%, 0.07% boric acid.

The water density
It can vary according to the salinity and temperature. The medium value used in naval architecture is 1.025Kg m³

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