on fresh salt water
Saltwater.
Salt water is denser that fresh water, so a swimmer (and ships) float higher in saltwater.
No. Toys float better on salt water than on fresh water because salt water has higher density, and the ratio of density controls buoyancy.
Because salt is dense, so denser the water the better you float!
salt water
Yes.
If you just barely float in salt water, you will sink in fresh water.
It is easier to float in salt water than in fresh water.
The more salt there is in the water, the easier it is to float.
Adding Salt to the water increases the density of the water, and therefore makes it weight more per capita. This in turn causes the salty water to push down with more force then water with no salt, causes things that may not float, to float, and things that already float in normal water, to float higher in salty water.
Because salt water is denser than fresh water.
The dissolved salt increases the density of the water and makes a swimmer more buoyant. They don't need to try as hard to float as they would in fresh water.