Does plain water have an expiration date? If so, for how long?

Does plain water have an expiration date? If so, for how long?

If the weather exceeds about 30°C, the humidity in the air is relatively high, and the bacteria multiply faster. Boiled water that loses its activity is easy to cause pollution overnight.

You can take a small glass on the first night and mix it with hot water the next day, preferably with warm water. When the water is left for 24 hours after boiling, the nitrite content in the water is twice as high as when it was first boiled. The longer you leave it, the more nitrite content you can have, and it is recommended to burn as much as you want.

In order to save water, some people often reheat the leftover boiled water, which is a bad habit. Because repeated boiling of water will cause the aging of water, it will not only cause the loss of minerals that are beneficial to the human body, but also may produce some harmful substances such as nitrite.

Once nitrite enters the human body in large quantities, it can make the red blood cells in the blood lose the function of carrying oxygen, resulting in tissue hypoxia, people will drink this water for a long time will cause nausea, vomiting, headache, nails and lips purple, palpitation and other symptoms, serious can also cause hypoxia, and may even induce cancer.

After getting up in the morning, drink a cup of cold and white, which is good for health. Many people like to dry a glass of boiling water the night before and drink it again the next morning. This is okay when the temperature is not high; For example, in summer, when the temperature exceeds 30 degrees Celsius, the air humidity is high, and the bacteria multiply quickly, the cold boiled water overnight will lose its biological activity, and it is very easy to be contaminated and cause diarrhea.

You can pour half a small cup of boiled water the night before, then cover the lid, and mix the boiling water with warm water the next morning.

In addition, the time of cooling and boiling should not be too long, and the boiling water boiled on the same day is best drunk on the same day. It is best not to drink it again if it is left cool for more than 3 days.

To sum up, drinking more water can maintain the normal water content of the human body, prevent the organs of the human body from aging due to lack of water, water occupies a large proportion in the human body, lack of water will make the blood viscous of the human body, drinking more can promote metabolism, can detoxify, and has a certain effect. But it's best not to drink overnight water.

Boiled water actually has a shelf life, the shelf life is about two hours, two hours after the boiled water is cold, this time it will pass the shelf life, after it is cold, bacteria will enter the water, then you can no longer drink it.

Some. The shelf life of boiled water is generally 8-12 hours. After boiling water, the bacteria inside will be killed, but it is impossible to keep it closed for a long time, so bacteria will still enter.

There is an expiration date, 12 hours. After boiling water, the minerals and other substances in it have undergone qualitative changes, and if left for too long, bacteria will breed and should not be drunk.

Of course, boiled water has an expiration date, and bacteria will increase after a long time, so it is best not to leave the water after boiling. "The shelf life of boiled water is only 16 hours". Because water does not contain proteins or sugars, it is not damaged and decomposed by microorganisms at room temperature like other foods.

However, do many people often have some water left in their cups, and the next time they pour it out, they just flush the cup and use it again? If you take a sample from the water cup left overnight for electron microscopy, you can see that there are many E. coli in the water body left in the water from the water cup. If the environment is right, 1 E. coli can multiply 2 million in one night!

Therefore, there will indeed be some microorganisms in the overnight water, compared with the boiled water that has just been boiled and cooled, the water quality of the overnight water or the boiled water after more than ten hours is indeed not as good as before.

Many people say that the shelf life of boiled water is 16 hours, but the real way to see the shelf life of boiled water should be to look at its temperature, once its temperature is lower than 60 degrees Celsius, you can no longer drink it, because no matter what it is, it is easy to breed bacteria The so-called boiled water, which is water that boils for 3 minutes after boiling, pours it into a clean cup, and cools to 25 30. Fresh boiled water is sterile, and the pathogenic microorganisms in it are killed during the boiling process. But after the boiling water temperature drops to room temperature.

<> for healthy people, drinking water with excessive bacteria for a long time is a subtle impact on the body, and the longer the time accumulates, the more obvious the impact on health. Water in a sterile state has no expiration date. Obviously, boiled water, as drinking water for daily life, is not kept in a sterile state.

Therefore, boiled water also has a time limit for drinking.

Because the shelf life of boiled water will also be affected by many objective environments, such as the cleanliness and heat preservation of the container containing open water, what is the room temperature, whether it is covered and stored, and the tightness of the container. If the boiled water is kept in a thermos with good heat retention, there is a reducing substance that converts nitrate into nitrite. As long as boiled water meets national standards, mineral water, purified water, etc., the nitrate content is very small, and the technical term is called trace amount.

Due to the aging of water caused by repeated boiling of water, it will not only cause the loss of minerals that are beneficial to the human body, but also may produce some harmful substances such as nitrite. Once nitrite enters the human body in large quantities, it can make the red blood cells in the blood lose the function of carrying oxygen. Second, boiled water cools slowly in the summer when it cools naturally, which is inherently difficult for bacteria to breed; Third, plain water, unlike soups and foods, provides an adequate nutrient base for microorganisms. It will be better to drink boiled water for three days, because boiling water that has been left for too long will produce a large amount of nitrite and carcinogens, so it is better to drink it as soon as possible.

Of course there is an expiration date. If you drink it, you will be infected by bacteria, and the nitrite in these bacteria may cause people to have symptoms such as nausea, dizziness, vomiting, and palpitation.

Of course there is. If you don't have a lid on it, it's best not to drink it overnight. Even if you put the lid on for more than two days, don't drink it again.

There is an expiration date. It is best not to drink overnight water, because drinking overnight water is still very harmful to your body, so you should not drink it.

There is no specific shelf life of boiled water, in the case of no sealing, if you see floating dust on the water surface, it is not recommended to continue drinking, if it is in a sealed state, you need to smell the water before drinking, and if you smell a peculiar smell, do not drink it.

Boiled water also has an expiration date, and it cannot be drunk after 12 hours of boiled water, and there are a lot of bacteria in boiled water after 12 hours.

I think boiled water also has an expiration date, and generally don't drink boiled water after a few days, because it is in contact with the air for too long, and there will be a lot of bacteria and microorganisms that cannot be seen!

Water must also have an expiration date, fresh boiling water, 12 hours after the expiration date, so try to buy a thermos cup, if there is no condition, then if the boiling water has more than 12 hours later, try not to use it again.

Like that kind of packaging, it has a shelf life, generally about seven or eight days, especially some boiling water, try not to drink it overnight.

Yes, it is usually for 12 hours, and after this time, try not to drink this water.

A glass of water has a lifespan of up to 16 hours.

From the second the water is poured into the cup, it enters the countdown of drinking water "insurance". The water that looked good overnight and tasted unpleasant had already gone bad. You're not just drinking water, it's bacteria.

The shelf life of boiled water circulating on the Internet is only 16 hours, and there are no relevant experiments and data to prove that boiled water should not be left for too long, even if there is no expiration date, it is best not to drink boiled water that has been stored for several days. Bottled purified water is recommended to be drunk within a week. When using a water dispenser to drink water, it is best to drink boiled water, as the number of microorganisms is likely to exceed the standard after leaving cold water for a long time.

Therefore, whether it is boiled water or bottled or bottled pure water, it should be used in time to avoid physical damage caused by excessive microorganisms.

Boiling water should not be stored for too long...

If water is stored for too long, it can become infected by bacteria and produce nitrite.

Once nitrite enters the body in large quantities, it can deprive tissues of oxygen.

Nitrite can also form nitrosamines in the human body.

Promotes liver cancer. Do not exceed the limbs for 24 hours, and generally pour out the water in the bottle overnight.

After boiling water for more than three days, it should not be drunk, and the above situation will occur after more than three days.

2. The cups and wild containers of boiled water need to be cleaned frequently, because it is easy to produce scale.

3. Glasses are best used for cups and containers for boiled water.

1. Boiled water has a shelf life.

2. Boiling water, putting in a hot water bottle with good airtightness or storing it with a lid can greatly isolate the bacteria in the environment and prolong the shelf life of the orange Zen group, but it should not be left for too long. Generally speaking, it is not recommended to drink boiled water with a lid and a handshake for more than 2 days.

3. After boiling, boiled water, although it can be quickly cooled when left open, it will directly expose the boiling water to the air and accelerate deterioration.

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Problem description: I made two bottles of boiling water a day, but I couldn't drink them all in a day, and I didn't pour it. Later, it took two or three days to finish drinking. Is drinking such boiled water harmful to your health?

Analysis: Plain water also has a shelf life, and it should not be drunk after more than three days. Once the water is stored for too long, it will be infected by bacteria to produce nitrite, once nitrite enters the human body in large quantities, it can make the tissues hypoxic, nausea, vomiting, headache, palpitation and other symptoms, and in serious cases, it can also make people die of hypoxia.