When people are close to the fire source, they will feel warm. This is the heat from the fire source. This is the heat radiation. The best way to prevent the heat radiation is to reflect it back with a mirror.

For office workers, they need to bring an insulated lunch box every morning to solve the lunch problem at noon. So, do you know how long the insulated lunch box can keep warm?

The thermos bottle can not only keep heat, but also keep cold things at lower temperature. When a popsicle is put in, it can also isolate the hot air from outside from entering the bottle, and the hot and cold air cannot be convective to achieve the effect of keeping cold.

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 coo......

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 temperatu......

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?