why a person can swim more easily in sea water than compared to river water
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Sea water doesn't has as fast currents as there are in a river.
When salt is dissolved in water, as it is in ocean water, that dissolved salt adds to the mass of the water and makes the water denser than it would be without salt. Because objects float better on a dense surface, they float better on salt water than fresh water.
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HARRY POTTER FOREVER!
When salt is dissolved in water, as it is in ocean water, that dissolved salt adds to the mass of the water and makes the water denser than it would be without salt. Because objects float better on a dense surface, they float better on salt water than fresh water.
Hope it helps.
HARRY POTTER FOREVER!
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The human body, with a little effort can remain floating on water. The density of water is comparable to the average density of the human body. Swimming in sea water is easier, because sea water has a higher density than fresh water exerting more buoyant force.
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