how a person can swim in water even its density is more than water
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Density of a human being could be between 0.985 g/cm^3 and 1.15 g/cm^3. When a person inhales a lot of air inside, then the density changes to 0.950 g/cm^3. River Water may have a density of 1 gm/cm^3. Sea water may have a density of 1.02 gm/cm^3..
The buoyancy force exerted by water when a person is trying to float helps a lot. It balances a lot of the weight of the body. Often the body is not fully immersed inside water. So the balance force to stay afloat is provided by pushing water downwards by legs and hands.
The swimmer kicks water downwards with his/her legs. Also pushes water downwards and backwards with the hands and palms. So as per Newton's third law equal and opposite forces are exerted on him/her by water. So he/she stays afloat and moves forward.
The buoyancy force exerted by water when a person is trying to float helps a lot. It balances a lot of the weight of the body. Often the body is not fully immersed inside water. So the balance force to stay afloat is provided by pushing water downwards by legs and hands.
The swimmer kicks water downwards with his/her legs. Also pushes water downwards and backwards with the hands and palms. So as per Newton's third law equal and opposite forces are exerted on him/her by water. So he/she stays afloat and moves forward.
mathsphysics:
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If an object has a greater density than water, it sinks. If it is less dense than water, it floats. ... Salt dissolved in the water makes it more dense. So even if you haven't changed your body composition, you are less dense relative to the salty water, which helps you float on the surface.
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