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The density of the liquid water is rho = 1,000 kg/m3 or 1,0 g/cm3.

SI standard for density rho = mass m / volume V in kg/m3.

A fish should have a very similar density to the water it swims in. Archimedes' principle states that the buoyant force on an object is equal to the weight of the water it displaces. The total vertical force on a fish is that of gravity, the buoyant force, and any reaction force generated by swimming. If the fish were much denser than water or saltwater, as the case may be, the weight of the displaced water would be much less than the fish's weight, and the fish would sink. If the fish were much less dense, then the fish would float to the surface. To keep at a desired depth, perhaps with a little help from swimming, the fish should be about as dense as the water it swims in.

Many fish have a swim bladder, also called a "gas bladder", which fills with a gas, usually oxygen, and which helps regulate the fish's average density. The rest of the fish then is a bit denser on average than water.

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