Why can t people save their lives by drinking seawater? Please briefly

The question of whether seawater can be drunk as a last resort is currently being debated. Some people believe that the salinity of seawater is four times higher than the salt content of the human body, and drinking seawater will increase the total osmotic pressure in the body, although it can quench thirst temporarily, but soon it will urinate profusely, causing a large loss of water in the body. However, there are also many people who believe that a small amount of seawater in a short period of time will help prolong life.

Some people experimented, from the first day of falling into the sea, drink 50 ml each time, drink only 500 ml a day, drink 4 or 5 days later, and then drink fresh water, as a result, the metabolism in the experimenter's body quickly returned to normal.

French Dr. Alain Bombard, who has been hailed as a "role model for the navy", said: "If you have fresh water, add seawater to extend your water supply time with strict control of the proportion; If you don't have fresh water, drink seawater to save your life until you can get rain, get a fish to squeeze into juice, or wait until the lifeboat arrives. Alain Bombal is not advocating drinking seawater, but emphasizing that drinking seawater should only be strictly controlled in life-and-death emergencies.

Alain Bombal's experience is that the ratio of 2:1, that is, drinking two parts fresh water and one part seawater, generally does not harm the human body, but greatly prolongs the life of the shipwrecked at sea. Because only when you have time can you gather the strength to fish and collect rainwater, to continue sailing and to signal the rescue boats.

Brieau-Orly, a famous French naval chief medicinal, wrote in a recent book: "The victim can drink a small amount of seawater, up to 800 900 milliliters a day, and do not wait until he is completely dehydrated." "In the Second World War, there were three wrecked sailors, drifting in the Black Sea, they drank seawater to quench their thirst, one of them drank for 34 days in a row, he could only moisten his throat with bitter and astringent seawater for the first two days, and then he drank one or two sips, and on the third day, he was so thirsty that he drank a lot of it, and drank about 2,000 milliliters in one day and night, however, he survived.

It seems that drinking seawater in small quantities is also an emergency solution in the absence of fresh water.

Because seawater contains a lot of salt, not only does it not quench thirst, but it will harm the body, and there are many microorganisms and bacteria in seawater, which will also harm our body.

Answer: Seawater is poisonous, and drinking seawater to save your life is tantamount to drinking doves to quench your thirst.

There are many harmful substances to the human body.

It's very simple: sea water is salty and people drink fresh water.

The body can't stand the high salinity.

This is because the water that people ingest into their bodies every day passes through the kidneys and excretes it into urine or sweat. The kidneys have limited excretion function, and generally excrete no more than 2% of salt, while the salt content of seawater is as high.

If you drink seawater directly, it will not only overburden the urinary system, but also in order to discharge the salt brought in by every 100 grams of seawater, the human body needs to supplement an additional 75 grams of fresh water to dilute the seawater to 2%.

In this way, the human body has to excrete 175 grams of water. If a person drinks seawater and has not replenished fresh water, it can only consume the original water in the body.

The role of seawater

Salt from seawater.

China's sea salt production has developed rapidly, and 11 coastal provinces, autonomous regions, and municipalities directly under the central government have salt pans, and the area of salt pans has increased by a large margin compared with the early days of the founding of the People's Republic of China. The quality of the sea salt produced is also constantly improving, and the variety is increasing.

In addition to raw salt, washing salt, crushed washing salt, refined salt, iodized salt, table salt, casing salt, egg yolk salt and beach fine salt have been put into mass production, and seasoning salt, livestock salt bricks and so on are being put into trial production.

Seawater becomes fertilizer.

Potassium is the sixth largest source in seawater, with a total of 600 trillion tons. Potassium chloride is the fertilizer we extract from seawater. Potassium fertilizer is fast-working, easy to be absorbed by plants, and not easy to lose.

Potassium fertilizer can make crop stalks grow stronger, prevent lodging, promote flowering and fruiting, and enhance resistance to cold, diseases and pests.

Because seawater contains a large number of salts and a variety of elements, the concentration of various substances in seawater is too high, far exceeding the drinking water health standards, if a large amount of drinking, it will lead to excessive entry of some elements into the human body, affecting the normal physiological function of the human body, and serious poisoning.

Seawater is a very complex multi-component aqueous solution. All elements in seawater exist in certain physical and chemical forms. The presence of copper in seawater is more complex, and most of it is in the form of organic compounds.

Among the free ions, only a small fraction exists in the form of divalent positive ions, and most of them occur as negative ion complexes.

Seawater is the "home" of salt, and seawater contains various salts, about 90% of which are sodium chloride, that is, table salt. In addition, it also contains magnesium chloride, magnesium sulfate, magnesium carbonate and other salts containing potassium, iodine, sodium, bromine and other elements. Magnesium chloride is the main ingredient of the brine used for tofu, and the taste is bitter, so the seawater with a large proportion of salt is salty and bitter to drink.

People can't drink seawater directly when they are thirsty, in addition to some minerals and salts, there are many impurities in seawater, which may cause bacterial infections and cause some adverse reactions.

Seawater cannot be drunk directly, and if you drink it directly when you are thirsty, it is likely to cause electrolyte imbalances and even poisoning.

This is because there is a lot of salt in seawater, which may cause our osmotic pressure to be different inside and out, resulting in dehydration.

There is a certain scientific reason why seawater cannot be drunk, if you encounter difficulties in the case of water shortage, you can choose to use seawater to extract freshwater resources to replenish water, remember not to drink seawater directly.

Because it is suitable for the human body to drink fresh water, but seawater is salty water, which cannot be absorbed by the body and can even lead to rapid dehydration, so seawater cannot be directly quoted, and it must be quoted by method distillation.

Because the salt content in seawater is too high, drinking it directly without extraction will make people feel very thirsty, and if it is serious, it can cause mental confusion, so you can't drink seawater when you are thirsty.

Because this sea water is relatively salinous, the more you drink it, the saltier it becomes, and it will make you more likely to get dehydrated, so you can't drink sea water.

This is because the sea water is salty, and if you drink it when you are thirsty, you will get thirstier and thirstier.

Because there is a lot of salt and impurities in the seawater, the taste is bitter and astringent, and it is not drinkable at all, and it is not good.

No, you can't stick to it after drinking.

Because after seawater enters the human body, not only can it not supply water to the body tissues, but on the contrary, it also takes the water in the human body and excretes it with the urine, which means that the water in the body does not increase after drinking seawater, but decreases!

The cause of this phenomenon is a phenomenon in the human body (including all animals)."Semi-permeable film"Something is at work. This film has a special property: it allows water molecules to pass through, but it does not allow solute (e.g. salt) dissolved in water to pass through.

If a U-shaped tube is separated into two equal parts with this film, an equal volume of water and a salt-like solution similar to seawater are injected into each of the two side tubes. If the amount of water injected into the left and right side pipes is the same as the liquid level of the salt solution, it stands to reason that the two liquids are in equilibrium. However, this is not the case.

After a short period of time, the liquid level on the left and right sides stabilized at different heights. The level of the salt solution rises, but the level of the water falls. It seems that the water has penetrated into the salt solution, which is called this phenomenon"Infiltration"。

The pressure generated by the height difference between the two liquid levels at the final equilibrium is called"Osmotic pressure"。

Why can't you drink seawater even if you die of thirst, but you can drink salt water? Be sure to pay attention after reading it.

1. Seawater contains a large number of salts and various elements.

2. The concentration of various substances in seawater is too high, far exceeding the drinking water hygiene standard.

3. If you drink a large amount of it, it will cause some elements to enter the human body in excess, affect the normal physiological function of the human body, and cause poisoning in serious cases.