Can you drink seawater directly??? Can you drink seawater

Yes, in the Navy lifesaving The ratio of fresh water to seawater is 7:1, which can be drunk, but it should be drunk in multiple times It is better not to drink Thank you.

Why can't you drink seawater?

No. Because the salt content of the sea is very high.

No, because it contains too much alkali.

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.

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 in Hongbi was 12 times higher than that of those who did not drink seawater. Why is that? Originally, in order to expel 100 grams of salts contained in seawater, the human body had to excrete about 150 grams of water.

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?

Sea salt is formed by the evaporation and crystallization of seawater, and there are many other toxic or harmful substances in seawater, and the salt content is too high, so seawater can not drink sea salt In the formation process, other substances are emitted or removed with evaporation, leaving only salt crystallization, so sea salt can be eaten.

Seawater salt can not be eaten directly Ordinary salt is sodium chloride and iodine, and sea salt contains magnesium chloride and other impurities, which need to be processed before eating the salt produced by seawater drying, which is generally not directly edible, because the sun-dried salt is coarse salt, which contains more impurities, and there is no "iodine" added to the directly dried salt.

Some specific sea areas, such as closed sea areas with a large number of rivers injected, such as the eastern part of the Sea of Azov, can be drunk with seawater, and large river estuaries can also be tried, but in principle, the open sea is certainly not, but in rare cases, such as submarine springs, the salt content is also very low, and it can be drunk in theory.

And the groundwater on the island, which is actually "light salt water", is not impossible, in short, if there is such a need for survival, just taste it.