a dead body float in water with its head downwards why
Answers
It is not necessary that bodies float face down.
When a person drowns, gases start building up in his body due to decomposition. These gases mostly build up in lungs and torso region. Hence, these regions are mostly buoyant and they rise quicker than the arms and legs which drags them down. Hence, the body overturns itself as it cannot drag it's limbs ( because you cant bend your arms backwards). And when the body reaches the surface, it will face down, most of the times.
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.