Why is it easier to swim in sea water than in river water?

 because of the extra salt in salt water, it is denser. therefore you float better.Because salt water has a higher specific density than fresh water. (Specific gravity of water is like the density of an object.) Imagine floating in fresh water that has a lower specific gravity, like frothy white water in a river. It is very hard to stay above the surface in that water. So you float higher in water that has a higher specific gravity. Another way to put this is that the lower the relative density (your density divided by the specific gravity of water) the easier it will be for you to float. If the Relative Density is greater than one, the object will sink. If it is less than one, the object (you, for example) will float. so much salt lifts you up. try the paper clip and paper towel trick sometime  In other words Salt water is heavier than fresh so therefore salt water can make you float.

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It is easier to swim in sea water than in river water, because sea water is denser than river water and the body sinks less in it.  thumps up plzz
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Sea water is salty as compared to river water. Therefore, they have higher upthrust when compared to river water. Since, higher upthrust the body comes to the surface of water. So, it becomes easy to sim in sea water than in river water.    

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Sea water contains many dissolved minerals and ions that cause it to be more dense than fresh water. Because of this, objects sea water exhibit greater buoyancy in sea water than fresh water (Objects displace an amount of water based on their volume but the buoyancy is determined by the weight of the water displaced). This effect of heightened buoyancy is also the reason people float or can swim so easily in high-salt lakes such as those in Utah and the Dead Sea.

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We know that the density of the sea water is more than the density of the river water. So, the weight of displaced sea water is more than the weight of displaced river water. This weight gives the upward Buoyant force to the swimmer. Thus, the apparent weight of the swimmer is less in the sea water. Hence he finds it easier to swim in the sea water.

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Salt water is denser and, therefore, more buoyant than fresh water so less of your energy is expended keeping afloat, and more is used to propel you along

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coz sea water is salty as a result the density of us becomes less than that of water and ultimately we float

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because sea the water is less density because of the saltness

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