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304 stainless steel and 316 stainless steel are commonly used in thermos bottle. The nature of 304 stainless steel and 316 stainless steel is not much different. All belong to American standard austenitic stainless steel.
The previous Weibo, “Bringing a meal at noon to become a cause of stomach cancer among young white-collar workers” was widely reposted. Roughly speaking, the nitrate contained in cooked dishes will be reduced to carcinogen nitrite during the storage process. Eating this kind of food will cause stomach cancer, so don't bring your own food in an insulated lunch box.
To identify the quality of the thermos bottle, take the bladder out of the bottle shell to see if the glass tail tube (shaped like a teat) under the bottle is damaged. If it is broken, it means that the air has entered the middle of the two layers of glass and it is impossible to keep the heat preservation.
Thermos bottle is a common water storage vessel in life, but it is easy to form scale on the surface after a long time. So, how to remove the scale in the boiling water bottle?
The concept of a thermos bottle is very simple: the bottle has an inner wall and an outer wall; there is a vacuum between the two walls, and there is nothing (not even air inside). Heat cannot be transferred through the vacuum, so any liquid poured into the bottle can maintain its original temperature for a long period of time.
Usually the food we put in the insulated lunch box is hot. At this time, the air in the insulated lunch box will be heated and expanded. When we close the lid and seal the insulated lunch box and leave the insulated lunch box for a period of time, the food and air in the insulated lunch box will cool down because it is in a sealed state.
