Question

Why does a person find swimming in sea water easier than in fresh water?

Answer 1

Weightlessness while swimming in seawater

1. Seawater contains salt, which increases its density, whereas river water does not.
2. According to Archimedes' principle, when a body is partially or completely immersed in a fluid, it experiences an upward buoyant force equal to the weight of the liquid displaced.
3. The weight of the liquid displaced is proportional to its volume and density.
4. The following formula is used, $Buoyantforceonbody=weightofthefluiddisplacedbybody.$
5. Because seawater contains salt, its density is greater than that of river water, which is fresh water.
6. As a result, the buoyant force provided by seawater to a body is greater than that provided by river freshwater.
7. Hence, swimming in seawater is easier because the buoyant force aids the swimmer.