how does a human body which sinks in water float on top of it when he dies?
603330
A dead body, after about 24 hours will normally afloat. Because human tissues started to decompose and microorganisms that are human's normal flora(pathogens living within the body) will start to create/form gas. They are commonly classified as gas-forming organisms. When they have form enough gases within the body to bring the body to the water surface, the body floats on the water.\n\nWe have to remember, that thru the process of mitosis, each single organism divides into two every fifteen minutes or sooner due to some mutation. Granting that we'll start counting them in millions, just imagine how much they will be in 24hours.
1013414
ANSWER 1: When a person drowns, water takes the place of air in the lungs. The body becomes heavier and sinks. It stays there until enough gas builds up inside the body from bacterial decomposition to make it buoyant and free it from the suction that silt and mud creates on the river bed, so that it surfaces. \n\nHow long this takes depends on the depth and temperature of the water, the amount of sunlight the corpse receives, and whether it is lying under a ledge or a bridge. \n\nWhether the body is lying on the north or south side of a waterway can also affect the time it takes to rise, because heating of the water varies on each bank. \n\nObviously, the body can take longer to rise if it is underneath something like a tree, or is caught by an underwater obstruction. I once studied a body that had risen to the surface with part of a brick wall tied to it by ropes around the chest. There were five bricks covered with mortar on each side of the body and still it floated. \n\nWhat's more, if a body is trapped by, say, its leg, the gases will keep forming until it is buoyant enough to detach itself from the trapped leg and rise up. \n\nBodies can also be washed into the side of a river and remain undiscovered, below an overhanging tree, for example. \n\nDebris piles up on top of the body and silt accumulates. If the body lies out of the Sun's rays, which cause much more rapid decomposition, it can remain there until a flood washes away the silt and debris. \n\nOf course, if the water is cold enough, the dead body may be held in "deep freeze" and it might never rise._New Scientist \n\n\nANSWER 2: Dead bodies undergo a series of changes, biological, chemical and physical, which eventually return the body's components to the food chain. \n\nThese changes and the speed of decomposition depend on where the body is. Decomposition in air is roughly twice as fast as it is underwater and about four times as fast as underground. \n\nA living person has almost the same density as water: when you breath in, you float, and when you breath out, you sink. \n\nThis is why dead bodies sink initially. \n\nThen the changes begin, and one of the most important is the bacterial decomposition of sugars and proteins in the tissues, mainly coliforms, Clostridium, Psedomonas and Proteus species. \n\nThese are anaerobic bacteria that normally live inside the large intestine, though they may come from an infected wound, such as gangrene. \n\nAs they feed on the decaying flesh, the bacteria excrete gases carbon dioxide and sulphur dioxide which inflate some body parts, mainly the face, abdomen and male genitals. \n\nBodies usually stay underwater for between one and two weeks, although this varies widely and some bodies never come up at all. One of the factors which affects this is the temperature of the water. \n\nContrary to common belief, there is no significant difference between the time it takes for male and female corpses to resurface. There is one notable difference though: while most corpses rise with spine uppermost, women and obese persons may rise face-up. This is caused by gas forming in breasts and large abdomens.
36432
Women usually float better than because the usually have more "fat" in the right areas. The most buoyant part of a person is the upper body because of the air in the lungs. Women (due to physical makeup) have most of there fat deposits in the butt and the leg area, and since fat is more buoyant than muscles it helps the legs float and appear more buoyant. Men have there fat deposited in their stomach region. Their legs tend to drop and not appear as buoyant as women.
656787
A newly dead human being, or any other animal, will sink when placed in water.  After the gases of decomposition build up in the chest and abdomen, however, the body will inflate, rise like a hydrogen-filled balloon, and pop to the surface, sometimes dragging with it surprisingly heavy weights that a murderer might have thought sufficient to keep it down.   With the passage of time and further decomposition, however, the body cavities eventually rupture, the gas escapes, and the corpse goes down again, this time for good.\n\nThere is one notable exception:  sometimes, due to air caught in the clothing, a body will stay on the surface for several hours before sinking.
420827
high density - at least compared to air. this is why anything sinks in a fluid; rocks are higher in density than water or air so they sink, helium balloons are lower density than air so they float.
687166
The air in the ball is less dense than the surrounding pool water so less dense things rise upwards like a balloon. Helium is lighter than the Oxygen/Nitrogen mix found in the atmosphere and it is exactly the same with the pool and the ball. And when you drop something in like a rock it sinks to the bottom because more dense objects fall through the more dense ones like rain. In a pool there's more water so it seems like the air is naturally on top but in rain there is more air so it's like a mix until the gravitational attraction/density problems are fixed.
24160
The energy that was stored in your body dissipates into the atmosphere, your body begins the process of decay, people who cared about you mourn you for a bit, you are either cremated or filled with embalming fluid after your organs and blood are removed, the rest of the world moves on with life and death.  Pretty much the same thing that happens to everyone...
480591
Not everyone can float. Usually thin people cannot. Due to the fact of not much body fat to displace the water. Larger people can, becuse of body fat. I am not picking on large people. Just stating a fact. I too am a large frame person with about 30% body fat.
1047922
It all depends on buoyancy and density. \n\nIf the weight of an object is less than the weight of the fluid the object would displace if it was fully submerged, then the object is less dense than the fluid and it floats at a level so it displaces the same weight of fluid as the weight of the object.\n\nIf the object has exactly the same density as the liquid, then it will stay still, neither sinking nor floating upwards, just as the liquid nearby stays still.\n\nUNLESS, \n\nAn object made of a material of higher density than the fluid, for example a metal object in water, can still float if it has a suitable shape (ex: hollow) that keeps a large enough volume of air below the surface level of the fluid. In that case, for the average density mentioned above, the air is included also, which may reduce this density to less than that of the fluid.
937883
Our heart is a pump, a very efficient one. The whole body consists of various circuits. And there are valves which control the flow of blood. Since the heart pumps blood, that is, it sends the blood at a certain pressure, the flood flows to various body parts and back, whatever the body position is, horizontal or vertical. This applies to the lowest part of our bodies (foot) too, when we stand up.
1054074
You float without weight there.
450269
Well if the ball is hollow then it will float. If the weight of the water displaced is greater than the weight of the object then it will float because the object is lighter then the area of water it is taking up.
122240
Buoyancy\nIn physics, buoyancy is an upward force on an object immersed in a fluid (i.e. a liquid or a gas), enabling it to float or at least to appear to become lighter. If the buoyancy exceeds the weight, then the object floats; if the weight exceeds the buoyancy, the object sinks. If the buoyancy equals the weight, the body has neutral buoyancy and may remain at its level. It was the ancient Greek, Archimedes of Syracuse, who first discovered the law of buoyancy, sometimes called Archimedes' principle:\n\nThe buoyant force is equal to the weight of the displaced fluid.\nSuppose a rock's weight is measured at 10 newtons when suspended by a string in a vacuum. Suppose that when the rock is lowered by the string into water, it displaces water whose weight is 3 newtons. The force it then exerts on the string from which it hangs will be 10 newtons minus the 3 newtons of buoyant force: 10 − 3 = 7 newtons.\n\nBuoyancy is the underlying principle of many vehicles such as boats, ships, balloons, and airships.
90516
This can be done with a density gradient column.  It is made of 2 fluids that are carefully mixed so that the density of the mixture varies from the top of the container to the bottom.  An object will then come to rest where its density matches the mixture.  This is actually a very accurate way of determining the density of materials.  However, over time the fluids in the column mix by diffusion and will eventually cause the suspended objects to sink or float.
606896
The water level will go down when you throw the body in.  Try it in your sink.  Fill your sink with water and float a bowl (boat) in it.  Then, fill the bowl with silver wear (body and rocks) or anything more dense than water.  Mark where the water level is on the side of the sink.  Now, take the silver wear out, and put it in the water so it falls to the bottom of the sink.  You will notice that the water level went down.  When the silver was in the bowl, it displaced much more water than when it was at the bottom of the sink.  Therefore, the body will displace more water when it is inside the boat than when it falls into the water.
255989
A stationary body submerged in a liquid is effected by two forces, gravity and buoyancy. Gravity acts at the center of mass and it is always directed straight down. On a rigid body, the center of gravity can be considered stationary in reference to the body. Buoyancy, on the other hand, acts at the center of buoyancy, and the center of buoyancy moves as the body tilts and rolls. The size of the gravity force is;\n\nFg = Mass * Gravity\nThe size of the buoyancy force is proportional to the volume of liquid that it displaces, the force of gravity and the density of the liquid.\n\nFb = (Volume * LiquidDensity) * gravity\nWhen an object is stable in the liquid, the gravity force and the buoyancy force cancel each other out. This means that the boat is displacing an amount of liquid that weight as much as the boat does itself.\n\nFg = Fb
850761
The human body is made of 70% water, although gravity has the same pull the weight in the water of the body is about 1/4th of the weight on the ground..☺