The heat-resistant temperature of human oral cavity is 50℃-60℃. The normal temperature of the human oral cavity is 36.2℃-37.4℃. A temperature of fifty to sixty degrees Celsius can burn the mouth, but in fact, the food that the human body feels very hot is sixty to seventy degrees Celsius. Nowadays, the insulation function of the thermos is getting better and better. After pouring the freshly boiled water into the thermos and leaving it for half a day, the water temperature can still reach above 70°C, enough to burn people.
