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Things float better in salt water than fresh water due to the mass and density of the salt as opposed to that of the water.

Sodium chloride (Being the classic "salt" people are familiar with) has a density of 2.165 grams per cubic centimeter, while water has a density of 1 gram per cubic centimeter. Thus, when the two are mixed and the salt dissolves evenly throughout the solvent (water), the density increases.

At least, in layman terms.

Now, an object sinks in a fluid when the density of that object is greater than that of the fluid. Since fresh water has a density of 1, and salt water has some density greater than that (dependent upon how much salt is dissolved in it), then more objects will likely have a density greater than that of the less dense fluid (fresh water) than that of the more dense fluid (salt water) With that logic, fewer objects will have more density than that of salt water, and therefore, more things will float in it.

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15y ago

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