Bottled mineral water sold on the market will always have a shelf life, and the water that exceeds the shelf life can no longer be sold or drunk, and must be sent to the treatment plant to be disposed of according to the expired food.
We deal with water every day, but we know very little about it, and maybe at some point we take a sip of water that is "expired."
<h1 class="pgc-h-arrow-right" > the importance of water</h1>
Water is also known as the "source of life", as early as 3.8 billion years ago, the first life on the earth was born in water, all living things originated in the ocean, it can be said that without water, there would be no earth rich in species now.
How important is water to people? If a person simply does not eat, then he can live for about two weeks; but if he does not drink water, he cannot last for seven days.
Why do people live without water? In the dream of the Red Chamber, Jia Baoyu said: "The daughter is made of water, and the boy is made of mud." In fact, he is not completely right, regardless of men and women, 70% of the whole body is water, the water content of newborn babies is as high as 80%, we humans can be said to be really "made of water". Every physiological activity of human beings is inseparable from water.
When humans think about moving their brains, they need enough blood for the brain to run, and when they grow and develop, the hormonal changes in the body need blood to be transmitted, and the blood transports red blood cells to supply oxygen to the organs. Once the water in the human body is not enough, the normal operation of the above physiology will be affected, and soon the human immunity will decline, get sick, and finally die.
Knowing how important water is, usually drink water well, doctors recommend that adults best drink 1500 to 2000 ml of water every day, do not wait for their thirst to drink again, do not drink too much water at a time, and arrange the average amount of water.
In addition to the body needs water, our daily activities are also inseparable from water, human beings use water to bathe and wash clothes to maintain hygiene, when painting, whether it is oil painting, watercolor or ink, we must use water, the cooling box of the car is also filled with water. Humans cannot imagine what would happen when the world left water.
<h1 class= "pgc-h-arrow-right" > water on Earth</h1>
More than 70% of the earth is covered by water, the vast majority of which is seawater, and fresh water is found in rivers, lakes and glaciers on land.
Because only fresh water can be drunk, the freshwater resources on the earth are scarce, accounting for less than 3%, and most of them are glaciers that are difficult for humans to exploit, and the freshwater resources that can really be used account for only 0.32% of the total resources, and the distribution is uneven. Many parts of the planet suffer from severe water shortages, and some countries even go so far as to spend high costs to desalinate seawater to alleviate their own water crises. In many places, in order to compete for water resources, they have reached the point of sword fighting.
Most people are concerned about water scarcity, and few people pay attention to the fact that the water resources we use, after the research of scientists, have been on the earth for 4.4 billion years, and these waters are stored in a limited earth space, according to our food standards, is this not a long time overdue? Why doesn't this water stink when it expires, but instead humans emit pollutants that make it stink?
So why does water circulate on Earth for 4.4 billion years without expiring, and when it is put in bottles, it expires quickly?
<h1 class="pgc-h-arrow-right >" why does the water in the bottle expire? </h1>
Water, if according to the chemical naming method should be called hydrogen monoxide, is an extremely stable compound, it is composed of two hydrogen ions and an oxygen ion combined, not easy to decompose, need electrolysis to separate oxygen and hydrogen, natural conditions are not easy to be oxidized. That is to say, we fill a bottle of water, and after a long time it will still be water and will not decompose into other substances.
So why do we think that the water in the bottle tastes bad after a long time? And why do our families tell us not to drink overnight boiling water?
Because the water in reality, most of them are not pure, there are various impurities, but also mixed with bacteria, contact with the air, some of them react with the oxygen in the air, bacteria multiply in it, only to cause the phenomenon of water expiration, in fact, the expired is not water, is the impurity inside, the main component of the bottle of water has not changed.
That being the case, why should bottled pure water that has been treated by a water purification plant and sealed be labeled with a shelf life?
That's because the current technology can't seal bottled water one hundred percent, and no matter how tightly sealed the lid of the water bottle, it can't completely isolate the air unless you put it in a vacuum environment. It is these tiny crevices that allow bacteria in the air to drill in. After the bottled water is removed and then covered, there will be more bacteria, it will expire soon, and the water will still smell.
There is also the most content in water is sodium, long-term presence in water, will produce harmful sodium nitrate to the human body, and the material for making bottles is separated from oil organic matter, water is a good solvent, long-term contact with plastic bottles, plastic benzene ring substances will penetrate into the water.
If the water in the bottle does not expire, and what expires is the impurities and bacteria inside, then the water in nature is also not pure, and the impurities in it are even more than humans drink, why is it not affected by these factors and expires?
This has to say that water in nature has a strong self-purification ability.
<h1 class= "pgc-h-arrow-right" > water body self-purification</h1>
There are pollutants in nature, such as animal feces, rotten plants, etc., which can pollute water sources when they enter water bodies. However, water in nature is a moving medium, and not only that, it is also an ecosystem with not only inorganic mineral elements, but also organic organisms.
Water is a good reaction environment, and these inorganic organic individuals carry out various physical, chemical and biological reactions in the water.
The first is a physical reaction, in which the contaminants enter, diluted by water, and then stratified according to the diluted density. If the density is larger than that of water, it will sink to the bottom, the density is comparable to that of water, it will be suspended in the water body, and if the density is smaller than that of water, it will surface.
The subsequent chemical and biological reactions can be said to be carried out simultaneously. Some microorganisms in the water can photosynthesize, and when the sunlight shines into the water, they begin to make oxygen. Oxygen is not easily soluble in water, and is usually used by organisms in the water, and excess will overflow from the water.
The oxygen released by the producers encounters diluted contaminants in the water, and in the process, they undergo a redox reaction, and the product is again used by the organisms in the water. If the diluted contaminants still cannot react directly, there are decomposers in the water, which further make the contaminants small molecules. In addition, consumers in the water will also play a role in this process, some fish will eat pollutants, and their intestines also have a large microbiota, which will eat the pollutants into the stomach and then excrete them, which is conducive to decomposers.
Whether it is the bottom of the water, the pollutants in the water, or the surface of the water, they will be purified by the producers, consumers and decomposers inside, and finally the water is still the previous water, and there is no expiration.
The water in nature fully interprets the saying "flowing water is not rotten", because the flow, which constitutes an ecosystem, because there is a complete ecosystem, they cooperate with each other to remove the impurities that are easy to expire in the water, so that the water in nature has an unlimited shelf life.
This is exactly the step that humans lack after putting water in a bottle. Because the water is confined to a limited container, without flow or contact with the outside world, the organic and inorganic substances inside cannot react effectively, especially the microorganisms inside, which will soon die in large numbers due to the exhaustion of oxygen in the water, and their corpses lack decomposers to cause the water to emit a peculiar smell.
After the death of microorganisms, it is impossible to use the inorganic substances in the water, and some ions in the free state combine with each other to produce precipitation, which is why the expired bottled water is very turbid, and there are some sediments.
<h1 class="pgc-h-arrow-right" > how to ensure that water does not expire? </h1>
Although the water in nature never expires, it does not mean that humans can drink it casually. Because self-purification is a long process, it is very likely that the saliva that people drink is in the process of self-purification. In addition, there are other creatures in the water of nature, which may not be good for people, and drinking them is counterproductive.
Water is very important for human beings, drinking water can be said to be what humans must do every day, and how to drink water has become a problem that people worry about. To this end, humans use technology to remove all the ingredients that make water expire.
The waterworks introduce the water from the water source, and at this time the water has left nature and is no longer living water, and the first step is to kill the microorganisms inside, and then filter the impurities and microorganisms inside. The next step is to remove the inorganic substances inside, precipitate them chemically, and then filter them.
This step is not finished, the factor that will make the water expire has been eliminated, the water in the water plant is still stagnant water, if installed in a limited space, it is inevitable to contact the air, so humans simulate the water circulation in nature, so that the treated water flows, which is like humans will become a "river" after treatment, the installed water pipe has become countless "tributaries", if properly treated, the water released by the water pipe can be directly drunk.
Also pay attention to not to put the water in the container containing water for too long, should be drunk in time, clean the container frequently, often replace the faucet or faucet disinfection, so that do not let impurities into the water, otherwise the water will soon deteriorate.
<h1 class="pgc-h-arrow-right" > water shortage</h1>
Humans can use technology to make themselves drink quiet water that has not expired. However, all this is based on the premise of having sufficient water resources, and if there is no water source, even the most powerful waterworks may be "difficult for smart women to cook without rice".
Freshwater resources account for only 0.5% of all water resources, and nearly 70% of freshwater is fixed in the ice of Antarctica and Greenland.
As the population continues to grow, the amount of water used continues to increase. Water resources are unevenly distributed, with low rainfall in some areas and a shortage of surface groundwater resources. The United Nations estimates that some 300 million people in 26 countries are extremely short of water. There is also a serious problem of waste of water resources around the world, with factories discharging pollutants directly into freshwater rivers that exceed the capacity of natural bodies of water to self-purify, making the region's freshwater resources unusable.
The problem of water scarcity makes people in many areas have no time to think about the quality of the water and do not care that the water expires in bottles. Because for people who are dehydrated, it is better to have expired water than no water.
< h1 class="pgc-h-arrow-right" > concluding remarks</h1>
When water exists in nature it is immortal, when it is "imprisoned" by humans, it loses its vitality, and then disappears the spirit of water is drunk, you think you drink a bottle of water, in fact, it may be "a whole bottle of bacteria".
If water resources are given by nature, in order to allow organisms to survive and reproduce, then wasting polluted water resources is against nature, and the final result is naturally borne by the destroyed person.