Boiling water may seem like a trivial matter in daily life, but in fact there is a lot of knowledge involved.

1. We usually boil water to kill microorganisms in the water. Boiling water is the best sterilization method. However, the excretions of microorganisms in the water, especially the endotoxins released after the killing of pathogenic bacteria, cannot be killed at 100°C, so the water should be boiled for 2 to 3 minutes before turning off the heat.

2. When boiling water, when the water reaches close to 100℃, the lid should be opened to allow some residual volatile organic compounds in the water to evaporate. After boiling for 2 to 3 minutes, turn off the heat. .

3. Due to secondary pollution problems in distribution pipelines and water storage tanks, water stored in tap water pipes for too long should not be boiled directly for drinking. In the early morning, you should open the faucet and let the water drain for 5 to 10 minutes before boiling it for drinking. The running water can be used to clean floors or toilets, etc. In addition, you can also put the water in a container to purify and settle naturally before boiling it for drinking.

4. Water cannot be boiled repeatedly. It is best to drink it now. Water that has been boiled repeatedly is "thousand boiling water", which is stagnant water. Drinking it will accelerate human aging. If the water is stored for too long, it will be polluted by the outside world, and the water will easily age and form stagnant water overnight.

Five kinds of boiled water are not suitable for drinking.

One is water that has been boiling on the stove all night. The second is stale water that has been stored in a thermos bottle for many days.

The third is residual boiling water that has been boiled repeatedly for many times, such as an electric-heated water dispenser that continuously heats automatically. The fourth is boiled water that has been reboiled overnight or not reboiled in the boiling water boiler.

The fifth is the "waste" after steaming rice and meat. The reason is: Boiling water that has been boiled repeatedly contains more heavy metal particles such as calcium, magnesium, and chlorine, which can have a harmful effect on human kidneys and cause people to suffer from kidney stones. In this kind of water, the amount of nitrite increases. It combines with hemoglobin in the human body and turns into methemoglobin, which makes it difficult for the blood to transport oxygen and is more harmful to human health.

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