Why is seawater undrinkable?

Seawater contains a large number of salts and a variety of elements, many of which are needed by the human body. However, the concentration of various substances in seawater is too high, far exceeding the drinking water health standard, if a large amount of drinking, it will lead to excessive entry of certain elements into the human body, affecting the normal physiological function of the human body, and serious poisoning.

If you drink seawater, you can take a lot of fresh water to remedy it. Large amounts of fresh water can dilute the excessive intake of minerals and elements by the body, excreting them from the body through sweat.

According to statistics, among those who died at sea, the mortality rate of those who drank seawater was 12 times higher than that of those who did not. Why is that? It turns out that the human body has to excrete about 150 grams of water in order to excrete 100 grams of salts contained in seawater.

Therefore, people who drink seawater not only cannot replenish the water that the human body needs, but also accelerate dehydration, and eventually cause death.

Seawater is drinkable after desalination. There are dozens of methods of seawater desalination, the most important ones are distillation, electroosmosis, freezing, membrane separation, etc. Distillation is the most widely used method nowadays, which is to heat and boil water to produce steam in seawater, and then condense the steam to become distilled water.

It is best to mix a small amount of (2) clean seawater or an appropriate amount of mineralizer into the fresh water prepared by distillation, so that the water tastes delicious, and also supplements the inorganic salts that are lacking in distilled water and necessary for the human body. In special circumstances such as distress and life-saving at sea, in order to save fresh water, part of the seawater can be mixed with fresh water for drinking. Some people have done experiments that people drink a mixture of seawater and freshwater for a short period of time, which is generally harmless to the human body.

Why can't you drink seawater?

There is a lot of salt in the seawater, which is higher than the concentration of human urine, and if a person wants to excrete these salts from the body, he must consume water to dilute them, and the result is that the more he drinks seawater, the more dehydrated he becomes. Fish have systems that can be desalinated, and many marine animals and plants have such systems (such as the tear ducts of sea turtles, the kidneys of marine fish, the leaves of mangroves, etc.), so many marine animals and plants can still survive normally although their body fluid concentrations are lower than those of seawater. Terrestrial animals do not have such a system, and when they drink, they become dehydrated, and the more they drink, the faster they die<>

The reason why seawater is salty is because there are about 3 5% salt in seawater, most of which is sodium chloride, and a small amount of chloride nucleated magnesium, potassium sulfate, calcium carbonate, etc. It is these salts that make the sea water bitter and astringent, and it is difficult for the sedan to collapse. Recently, it has been found that eating too salty vegetables is also a trigger for influenza, because eating too much salt reduces saliva secretion and makes the virus have a place to settle in the mouth; Second, sodium salt has high permeability, and the defense ability of epithelial cells in the mouth and throat will be inhibited, which is easy for influenza viruses to enter the human body.

There is a saying in France that "a beautiful woman is born in the mountains, not by the sea." This means that because women who close the circle at the beach usually consume more salt, they are prone to wrinkles. And women in mountainous areas eat less salt, ** tend to be smooth and delicate.

Why is it easy to get wrinkles after eating too much salt? Experts at the French National Academy of Medicine** explain that table salt is present in human blood and fluids in the form of sodium ions and chlorofaphra, which play a very important role in maintaining osmotic pressure, acid-base balance and water balance. If you eat too much salt, the sodium ion in the body will increase, which will lead to the loss of water in the facial cells, which will cause ** aging, and wrinkles will increase over time.

Medical experts caution against more than 6 grams of salt per day. Eating too much salt will not only cause high blood pressure, but also directly affect your appearance. If you want to be good, the more scientific way is to drink more water to help detoxify.

Medical studies have found that excessive daily salt consumption can easily cause cardiovascular diseases, so a low-salt diet is advocated. In addition, eating too much salt can also lead to upper respiratory tract infections. This is because a high-salt diet can reduce oral saliva secretion, lysozyme and lysozyme, coupled with the osmotic effect of a high-salt diet, the upper respiratory tract mucosa is weakened to resist the invasion of diseases, resulting in infection with upper respiratory tract diseases.

Eating something too salty for a long time can also affect bone growth. Because sodium and calcium are both minerals, when passing through the kidneys, sodium will be reused by the body more than calcium, so taking too much sodium will indirectly increase the loss of calcium in the urine and affect bone development.

The proportion of salts in seawater is very large, and the concentration of various substances is too high, far exceeding the drinking water hygiene standard, and if it is drunk in large quantities, it will cause poisoning. In order for the human body to expel 100 grams of salts from seawater, it needs to excrete about 150 grams of water. Therefore, people who drink seawater not only cannot replenish the water that the body needs, but will accelerate dehydration.

Seawater is drinkable, but it contains more impurities and is not suitable for drinking. If you drink a large amount, it is harmful to the body, and it is not a big problem to drink a little.

1. Drinking seawater directly will not really quench thirst, but will further dehydrate the human body. This is because seawater contains a lot of salt, which is higher than the concentration of fluid in the cells of the human body. When a person drinks seawater, the water in the cells of the human body is lost.

The cell membrane of the human body is a semi-permeable membrane, which is covered with many small pores, and only water molecules can pass freely, while chloride ions, sodium ions, etc. in seawater cannot pass directly.

2. However, because the concentration of seawater is greater than the concentration of the liquid in human cells, the difference in the concentration of the two will drive the water in the low-concentration liquid to penetrate through the semi-permeable membrane to the high-concentration side, until the concentration of the liquid on both sides of the membrane is close to equal, which is like water flowing to the lower place, and the water will penetrate through the semi-permeable membrane to the "thick" place.

3. Therefore, after drinking salty seawater, the water in the human cells will flow out through the cell membrane, resulting in serious dehydration of the cells. According to analysis, if you drink 100 grams of seawater, human cells will instead excrete about 150 grams of water.

The concentration of seawater is higher than the concentration of body fluids, and drinking seawater will cause the body to lose water to the high concentration of seawater, causing dehydration symptoms.

The tissue fluid and cells of the human body contain "salt water", which is a component of table salt, or sodium chloride, and the water is sent from the intestines to every cell by "grabbing" water molecules. To complete this process, the concentration of drinking water, blood, tissue fluid, and cell fluid must gradually increase.

Any link that drops the chain will only kill the cells that eventually want to "drink water". The salt content of seawater is usually more than three times that of human fluids, and if you drink seawater, it is absolutely impossible for the human body to "grab" water molecules. On the contrary, the already small amount of water in the human body will be absorbed by the high concentration of salt water entering the intestines, which will exacerbate the body's water shortage.

Therefore, seawater cannot be drunk directly, and the more you drink it, the thirstier you become.