Why is water boiled before drinking, and why can t freshly boiled water be drunk directly?

The bacteria in the water will be killed in the boiling water, and some alkaline substances in the water will also be turned into corresponding carbonates.

Boiling water is a relatively primitive method of disinfection and sterilization, and it can be a simple and economical method in areas with less water pollution. But today, the water pollution is serious today, it can not meet the requirements of human beings, 100 degrees of high temperature can only kill viruses and bacteria, but the carcass of chloroform and other bacteria in the water will be concentrated with the boiling water for a long time, and drinking it is harmful to the human body, and boiling water wastes gas, wastes electricity, and the taste of boiling water is also very poor. In today's increasingly improving living standards, it is time to find another shortcut, scale contains heavy metal substances harmful to the human body, such as cadmium Cd, aluminum PB, arsenic as, mercury Hg, these heavy metal ions can be toxic to the human body can mostly accumulate in the human body, and it is easy to lead to cancer lesions for a long time.

In general drinking water, there is a certain amount of nitrate, if it contains a large number of bacteria at the same time, especially Escherichia coli, then the moderate temperature when boiling water will make the bacteria release nitrate reductase, reductase can reduce the nitrate in the water to nitrite, so that the nitrite in the boiling water increases. After nitrite enters the human body fluid in large quantities, it can oxidize the divalent iron in hemoglobin into trivalent iron, so that the blood loses its oxygen-carrying function, resulting in hypoxic suffocation in the human body. If the water is stored for too long, the nitrite in the water will increase day by day, so the water can be stored for two or three days at most.

At the same time, it should be noted that the following water (also known as aged water) is not drinkable: water that has been boiling for a long time; water in a thermos or thermos for several days; Distilled water. Generally, waterworks use chlorine-containing disinfectants, in which the residual chlorine in the water and the residual organic matter in the water are combined to form trihalomethane, haloacetic acid, perchloroethylene, etc., some of which are carcinogens, and some have a good effect on the fetus.

With the increasing pollution of water sources, there is an increasing trend of disinfectant use in waterworks. When tap water is boiled to reach the boiling point, the content of trihalomethanes in the water will increase by 3-4 times compared with the content of the original cold water, so the tap water should be treated before drinking to purify the chlorine. How to decontaminate?

It's very simple: after the water is boiling, open the lid of the kettle, let the water boil for 2 minutes, let the residual volatile organic compounds in the water evaporate, and then turn off the heat.

Boiling water can kill some harmful microorganisms in the water, and can also minimize the harm of some harmful chemicals.

Tap water is chlorinated, in which chlorine combines with residual organic matter in the water to produce halogenated hydrocarbons, chloroform and other carcinogenic compounds. Chloroform is also a kind of carcinogenic compound, so boiled water cannot be drunk directly, and it becomes warm boiled water after the temperature drops.

The correct way to boil and drink water should be to connect the tap water first, and then leave it for a while before boiling; Then open the lid of the kettle when the water is about to boil, and finally wait for 3 minutes after the water is boiled before turning off the fire, which can reduce the chlorine content in the water to the safe drinking standard, which is real boiling water.

How it works. Plain water transports oxygen to the bloodstream; Waste products metabolized in the body are excreted from the body through urine or feces. lubrication of tissues and joints; moisten the eyes, nose, and mouth; Make **soft and elastic.

Regulates body temperature by evaporating or sweating, keeping the body temperature constant. Water is very important to the human body, whether it is the digestion, absorption, transportation and metabolism of nutrients, or the discharge of waste, or the regulation of physiological functions and body temperature, etc., it is inseparable from water.

Because water contains a lot of bacteria that are harmful to the human body, these bacteria cannot be seen by the naked eye, and we can choose to heat the water at high temperature to kill the bacteria.

The size of bacteria in the water is generally in the range. Bacteria can be roughly classified into 6 types, namely bacteria (narrow sense), actinomycetes, spirochetes, mycoplasma, rickettsia, and chlamydia. Diseases caused by common bacteria in water:

Vibrio cholerae - cholera, Escherichia coli - diarrhea, Salmonella - typhoid, Shigella - dysentery.

Who does not boil contains a variety of microorganisms, pathogens and a large number of bacteria, the human body is easy to be infected with bacteria when drinking this water for a long time, and even infected with hepatitis in severe cases. Drinking half-cooked water is bound to upset your stomach, such water is more harmful than raw water, and bacteria are most active before the water temperature reaches 100 degrees.

Water should be boiled for 3 minutes before use, because drinking water that is not thoroughly boiled is prone to illness, diarrhea, and even cancer.

There is no doubt that the file asks yesOK.

For filtered water, tap water, mountain spring water, or pure water, drinking water, if possible, we recommend boiling before drinking, of course, don't scratch the word, not to say that boiling water at 100 degrees Celsius to drink, it will burn! We're talking about boiling it here, and drinking it when it's cold, hee-hee. Water is not something we can drink when we look clean, there are many microorganisms in it that cannot be seen by the human eye, such as viruses, bacteria, parasite eggs and other pathogenic pathogens, so we advocate that even if it is bottled drinking water, not to mention tap water, we had better boil it before drinking, water boiling to 100 degrees Celsius, that is, when boiling, it can kill most of the pathogenic microorganisms, and boiling water to drink is the healthiest way.

Expansion: Tap water is disinfected by chlorine-containing disinfectants, and studies have shown that when boiling water to 100 degrees Celsius for three minutes, the harmful disinfectant components to the human body will be minimized, and it is the safest drinking water. In some areas with a lot of minerals, we do not recommend using tap water, because the filter device often cannot filter the mineral early state, and long-term drinking of such tap water can easily form kidney stones.

I am a doctor in the Women's and Children's Hospital, and many of the people who come to see the doctor at night are either children or adults.

Since tap water is a water source that is finally formed through processes such as chlorination and other bleaching and sterilization substances, filtration, etc., if it is not boiled, it is easy to cause problems such as chlorine residue, which is not good for health.

Experts point out that it is better for normal people to drink boiled water and mineral water every day. Mineral water contains minerals needed by the human body, which can supplement the needs of the human body, and is more suitable for normal people than pure water. Boiled water is easy to enter cells through the cell membrane, promote the body's metabolism, enhance the body's immune function, improve the body's ability to resist diseases, and is the most needed drinking water for the human body.