Because there is salt in sea water and salt makes you float better so is easier to swim.
You are more buoyant in salt water than in fresh water, so it takes less energy just to stay afloat, making it easier to swim.
It is easier to swim in the sea because of the amount of salt in sea water the density of the water is greater which make you float more easily.
Sea water is easier to float in, but wave make it harder to swim in.
It is easier to swim in the sea, as it is salt water as aoposed to fresh water sea water is also much saltier then water in a saltwater pool. that makes the sea water denser and the swimmer comparatively lighter.
Sea water is denser than fresh water due to the presence of dissolved salts, which increases its buoyancy and makes it easier for objects to float. The higher density of sea water also creates more buoyant force, helping things stay afloat more easily compared to fresh water.
Sea water contains lots of dissolved salts. Thus the density of the salty sea water is more than that of water in swimming pools, and the salty water lifts you more than fresh water, which make swimming easier.
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. Phil
The higher the salinity of the water the easier it is to float - the Dead Sea, the Caspian Sea, the Great Salt Lake.
The sea contains salt, which makes the water lots more dense. The water is then somehow easyer to float on. In the dead sea there is so much salt water, it is imposible to drown without forcefully holding your head under water
saltwater has salt in it, freshwater does not.
Salmon swim in the sea. Salmon are fish. Fish love water. The sea is water. Thus, salmon swim in the sea. Voila!
Of course. There are several species of sea going ducks including eiders and scoters. There would be no problem in a fresh water duck's swimming in salt water (in fact it's easier to float than in fresh water) but the salt water might eventually upset their metabolisms.