Water is an essential element of the human body, but the question of the shelf life of water often raises questions. What we see most often is the expiration date of bottled water, while tap water does not seem to have a clear expiration date. What's the secret?
First, we need to understand the basic makeup of water. Water is composed of two elements, hydrogen and oxygen, and its properties are relatively stable under normal conditions. Whether transitioning between liquid, gaseous or solid states, the intrinsic properties of water do not change. Most of the water in nature is living water, and after precipitation and decomposition, the pollutants in it will gradually disappear. Therefore, there is no possibility of deterioration for the water itself.
So, why does bottled water have an expiration date? This brings us to the special handling and storage conditions of bottled water. Bottled water is sterilized and sealed in containers, which should theoretically allow for a long shelf life of bottled water. However, this is not the case.
Let's take a closer look at the material of the mineral water bottle. There is usually a triangular arrow on the bottle body, which also contains the number 1, which indicates that the material of the mineral water bottle is PET polyester. This polymer may produce trace amounts of acetaldehyde when left for a long time or exposed to high temperatures and light, which may contaminate water quality.
In addition, despite the fact that bottled water has undergone treatment procedures such as filtration and sterilization, no one can guarantee that there is absolutely no organic matter or microorganisms in the water. In order to ensure the health of consumers, but also to be responsible for the products they produce, merchants often set a shelf life. This can avoid contamination of water quality by bacteria and microorganisms in the water to a certain extent.
The main reason for the spoilage of bottled water is not the water itself, but the material of the bottle and the conditions in which it is stored. Therefore, when we buy bottled water, we must pay attention to check the production date of the bottle and try to choose the latest date of the product. At the same time, once the bottled water is opened, it should also be drunk as soon as possible to avoid the adverse effects of water deterioration on the human body.
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