Question

Why dead people floating over the water

Answer 1

Hey.

Things float in water if they are less dense than water, i.e. they weigh less than the same volume of water. The density of a human body with a lung full of air is about 0.985kg/l - slightly less than water (1.0kg/l) - which is why, if I throw you in a swimming pool, you'll float with a small amount of you (0.015 by weight out of the water). If you don't hold your breath because you panic or because you're dead, your weight remains the same, but your volume is smaller. Your density therefore increases to - about 1.08kg/l. This is higher than water so a dead body will actually sink.
Hope this helps you

Answer 2

Why dead people floating over the water?

When someone drowns and dies, the body starts to sink because the air in its lungs is replaced produce enough gas(i.e,methane, hydrogen sulfide, and carbon dioxide).

As the gas is light the body float back to surface of water.slowly with water thus increasing density.

It remain submerged for some days until the bacteria in the gut and chest cavity.