People sink when they fall into the water, but why do they come back to the surface after they die?

For this question, it is necessary to understand the process of a person's drowning.

After a person falls into the water, it is difficult for you to see those pictures on TV in reality: people struggle desperately in the water and shout for help after falling into the water, in fact this is very difficult to do, but somewhat silent, because the person's mouth sinks below the surface of the water, and then resurfaces in order to breathe, once they can't hold their next breath, they will start to hyperventilate, and then they will start to inhale a lot of water, you know that it is very difficult to shout for help at this time, and the oxygen supply to the body will also be blocked, At this time, the person also began to lose consciousness, the body involuntarily became relaxed, then his lungs began to be filled with water, the air in the lungs was emptied, and the person sank.

Once a person is drowned, the body will not float up on the same day, it usually takes two to three days, mainly due to the continuous multiplication of bacteria in the body, producing a lot of putrefactive gas, at this time the average density of the human body will become smaller, and it will be less than the density of water, the gas in the normal human body will be naturally discharged from the body at any time after it is produced, but after drowning, it does not have such a function, and the gas produced will continue to accumulate in the body, and so on to a certain extent, that is, when the body density is less than the water, it will surface.

At noon, the author's colleague told me about a child drowning incident that had just occurred, last night his family found that the child went out to play and did not return all night, so they went out to look around, next to the local reservoir, found the child's shirt, immediately reported the case to seek help, and arranged for a water ghost this morning.

went into the water to salvage, but found that it was really drowned and sank into the reservoir. The child is only 11 years old this year, and the National Day holiday is about to end, and such a thing still happens, at the same age as a flower, life passes away suddenly, which makes people feel very pity.

People who can't swim accidentally fall into the water should actually try to save themselves. First of all, you must keep yourself calm and clear-headed, you can try to hit the water with your hands, which can create a certain buoyancy and also attract the attention of those around you. Secondly, if the body is weak at this time, it is necessary to relax the limbs, keep the back position, and tilt the head back, which can keep the body balanced in the water, ensure that the upper body temporarily floats on the water, and the oxygen supply of the key body will not be interrupted, in short, it is to gain precious time to wait for rescue.

After a person falls into the water, due to improper operation, the head will sink down, then the person is easy to be drowned, the lungs are flooded, and the gravity of the body is greater than the buoyancy, and he will sink. But after a certain point, the body absorbs a lot of water, which allows the corpse to float up due to some reason why our tissues and bacteria produce gas.

Because after death, the body has no breath and no weight, and the body becomes larger and swollen after being soaked in water for a long time, and the various organs lose their original reactions, so they will float to the surface, I think so.

Because a person's weight will be heavier, he will easily sink if he meets someone, and if a person dies, his weight will become lighter, and his body will enter the water and float up.

Because the weight of a person's body after falling into the water is greater than the buoyancy of the water, and after death, the body is soaked and can float on the water.

This is because after death, people will lose some fat or some gas, so at this time the weight of the person is very light, so it will float on the water.

When you die, you don't breathe, and there is no oxygen in your lungs, so you float to the surface.

Because the water content is very high when people are alive, and the fat content is also very high, if people die, the density will decrease a lot, so it will float.

Because throughout the process, the density of the human body changes.

Anyone who has ever watched a swimming competition knows that swimming is a competitive sport where all people are white and yellow, and there are almost no blacks. Because blacks have the highest human density, about 1% higher than whites, they are easy to sink in pools, it is more difficult to learn to swim, and blacks also need to overcome more resistance, which will lose their speed and be at a natural disadvantage.

People with a denser human body are more likely to sink to the bottom; People with less density of the human body are more likely to float, which is an important factor for people to rise and fall in the water. However, it does not mean that if the density of human beings is smaller than that of water, it will necessarily float, and the state of ups and downs is also related to human control of water.

In general, the density of the human body and the density of water are very close. Those who can swim can keep their heads out of the water and keep their bodies still; People who can't swim will sink to the bottom even if their body density is less than water.

People who can swim have better control over their bodies. They tend to habitually inhale more air, and the density of air is much less than that of water, which makes the human body less dense and easier to float; Swimmers know how to use their limbs to press water, and horizontal and vertical downward pressure can provide more upward momentum, and can find a balance after many practices.

This is not closely related to the density of the water, the main thing is that the gravitational pull of the earth and the muscles that cause the muscles to contract when you struggle in the water, the density increases, and it sinks, of course, weight is also a reason, generally speaking, people who can swim will master a certain method.

Because people struggle when they are conscious, a lot of breathing causes the amount of carbon 2 to increase.

And when he's calm, he doesn't, he absorbs oxygen and floats up.

This is not necessarily, some people will float, fat people are generally easy to float, and most people will sink if they don't take a breath. The density of people is about the same as water, you can experiment when you swim, take a breath, you will float on the surface of the water, and when it stabilizes, you will exhale slowly, and you will sink.

Most of our bodies are made up of water and have a similar density, plus we have a certain amount of gas in our bodies, so under normal circumstances, our weight is a little less than buoyancy. Bacteria and other microorganisms at the bottom settle in the body, decompose and multiply, and produce gases such as carbon dioxide, methane, and ammonia. These gases accumulate inside the body, which acts like a balloon"Blow it up", slowly expanding and rising.

After the gas is released, the body continues to sink. During the sinking process, the microorganisms continue to decompose and the body continues to decay, filling the body with gas again and then coming up again.

The largest body cavities are the abdomen and chest, which are also the places where microorganisms are most likely to gather, so once the microorganisms settle here, a large amount of gas produced will fill the chest, and generally speaking, the limbs of the human body are heavier and naturally droop in the direction of the face, not the other way around, so close most of the face downward. A drowning person does not surface immediately after death. Decaying bacteria in the human body begin to decompose, first in the intestines, producing water and carbon dioxide gas.

As carbon dioxide gas accumulates in the abdominal and thoracic cavities, the body expands to a point where it becomes less dense and can float to the surface. People with a dense body are more likely to sink; People with less body density tend to float more easily, which is a significant factor in the ups and downs of a person in the water. However, this does not mean that people are less dense than water and will rise, and the rise and fall are also related to the control of the person over the water.

In general, the density of the human body is very close to the density of water. Swimmers can stick their heads out of the water and keep their bodies still; People who can't swim, even if their bodies are less dense than water, sink to the bottom. If you can swim, you can control your body better.

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Because after a person falls into the water, the lungs enter the water, and the pressure in the body is greater than the water pressure, so it will sink down, and after the person drowns, it will swell, and the density of the body is less than that of water, and it will float to the surface.

After falling into the water, people often shout loudly for help, which can easily lead to death due to water in the mouth, and the buoyancy that comes to the surface after death is caused by buoyancy.

Because people will flutter back and forth after falling into the water, causing them to sink more and more; When a person dies, his body is filled with water and he floats on the surface.

The reason for this increase in buoyancy is actually very simple, it is the gas produced by the microbial activity in the body. Another obvious example is the whale.

Posthumous corpse**. It's all because of the large amount of gas produced by the decomposition of microorganisms inside. The specific gravity of the human body is slightly larger than that of water, and swimmers can float on the surface of the water, mainly because of the presence of air in the lungs, which reduces the average density.

When a person is drowning, the air in the lungs is emptied and the person sinks. Later, after a few days, it floated up again, because the bacteria in the intestines multiplied and released a large amount of gas, causing the average density to decrease again, and then floated up. The gas in the intestines is usually excreted in the form of a fart and is expelled during defecation, but the drowning person does not, so it collects in the abdominal cavity.

The so-called death and death, beginners think that as long as the head is submerged, it will sink to the bottom. Actually, it's an illusion. As long as there is enough air in the lungs before the head enters the water, it is impossible for a person to sink to the bottom.

The principle is that the human body is particularly buoyant when there is gas in the lungs. So the first thing to do after falling into the water is to struggle to take a deep breath, and then relax your whole body so that the water does not reach the top of your head. Over the next 5 seconds, the body will sink and then float up, and then calm down during this time.

Then consider floating or dog planing. First, let's be clear. There was no further struggle.

The living also floated on the water. <>

Because the density of the human body is still smaller than that of water, people are panicking, such as drowning and adrenaline.

Secretion, rapid heartbeat, muscle tightness, shortness of breath, etc., will cause the density of the human body to increase, and the random shaking of the body is also likely to produce downward force. When people are drowning, they may not all be underwater, as long as their heads are in the water. Drowning is highly likely.

After death, the muscles are no longer tense and the breathing is no longer rapid. As an "object" that is slightly less dense than water, it is normal for some of it to float on the surface of the water. Even non-swimmers can make sure they don't drown by adjusting their breathing, but it's not easy to keep their bodies completely relaxed because non-swimmers instinctively fear drowning.

In fact, the main thing is that after a person falls into the water, the gravity of the body will sink, but after death, the amount of blood will be greatly reduced, so the person will be lighter, so it will float.

The main reason is that people usually struggle desperately after falling into the water, which leads to sinking, and people no longer struggle after death, because of buoyancy, they will float up.

That is because the human body is relatively light, and the density of the human body is not as high as that of water, so it floats.

Because after a person dies, the buoyancy of the body will decrease, and the buoyancy of the person is not as large as the buoyancy of the water, which will make the human body float on the surface of the water.

Because of buoyancy. Water is more buoyant and will float people on water.

It floats because a large amount of gas accumulates in the body after death, so under the buoyancy of the water, the body is like a balloon and floats up.

When a person dies from drowning, the body swells, causing a decrease in density, and it comes to the surface.

Living people sink to the bottom when they drown, and they float up when they die. This is due to changes in the density of the human body. Generally speaking, the higher the density of the human body, the easier it is to sink to the bottom of the water, and the smaller the density of the human body, the easier it is to float.

In addition to this, it is also affected by a person's control over the water, and some people who can swim can ensure that they are still on the water. And I think it also has an effect on people's postures, because the posture in which you are drowning is completely different from the posture in which you are floating.

1. The influence of density on the human body is that the higher the density, the lower the density may sink to the bottom of the water, and the smaller density can naturally float. Of course, this does not mean that a person who is less dense than water will necessarily be able to float in water. The main thing is that when people get into the water, the density will change to a certain extent.

Just like an egg put in water, something will dissolve over time, and slowly the density will decrease, and it will naturally float. And after death, the density will also change to a certain extent. As the overall volume decreases, so does the density.

2. In addition to the influence of density, there are also factors of water control. Some people who can swim can easily control the water and ensure that they do not sink in the water. When you drown, you have lost control of the water, but your power will still affect the water.

At this time, you can only keep drinking water, and the more water in your body, the volume will slowly increase, and the density will also increase at this time. At this rate, you'll slowly sink. However, after a period of death, the density changes again.

At this point, you lose control of the water, and you can't influence the water with force, which is equivalent to the water controlling you.

3. The problem of posture is very important in the water, some people let themselves maintain a posture, even if they can't swim, they can float on the water. It's the equivalent of a balance that keeps you on the water. Just like a swamp, the larger the area you are stressed, the less likely it is to sink.

However, if the force area is small, it will slowly sink in.