Why it is easier to swim in the sea than in river?
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Answer:
Sea water contains dissolved salts and minerals, due to which its density is higher as compared to the river water. Now, upthrust due to a liquid is directly proportional to its density.
So, sea water exerts greater upward force (upthurst) on the swimmer as a smaller portion submerged in sea water displaces water equal to the total weight of the body while to displace same amount of river water a larger portion of body will have to be submerged , hence swimming is easier in sea water.
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Due to salt makes water more dense, which in turn makes you more buoyant. e.g. people float in the Dead Sea.
Explanation:
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