Difference between density of sea water and fresh water
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seawater has approximately 35 grams (1.2 oz) of dissolved salts.
Average density at the surface is 1.025 kg/L.
Seawater is denser than both fresh water and pure water (density 1.0 kg/L at 4 °C (39 °F)) because the dissolved salts increase the mass by a larger proportion than the volume.
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Answer: When salt is dissolved in water, as it is in sea water, that dissolved salt adds to the mass of the water and makes the sea water denser than it would be without salt.
Because objects float better on a dense surface, they float better on salt water than fresh water. The denser the salt water, the easier it is for objects to float on top of it.
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