The principle of hand warmers, types of hand warmers and their advantages

Hand warmers are a kind of heating product. In daily life, it is very common to use hand warmers, because hand warmers are easy to use, the appearance can be chosen at will, and there are many styles. Therefore, the use of hand warmers has always been popular among people. However, how much do you know about the working principle of hand warmers? In order for us to use hand warmers correctly, we must know the working principle of hand warmers.

Hand warmers and hand warmers can be referred to in general, but there are mainly two ways to use hand warmers :

One is disposable, and the plastic bag contains a lot of powder, such as iron powder, carbon powder, salt, etc. When using the hand warmer, you must tear the bag. The powder will react with oxygen in the air to generate heat. It can only be used once, and the usage time ranges from 8 to 14 hours.

The other type is reusable. A sealed plastic bag (PVC) contains some liquid and a small round metal piece. Just push the metal piece and the substance inside will change from liquid to crystal. This physical process will generate heat. Then put it in boiling water and boil it back to liquid state for next use. The heating time of this type can range from 30 minutes to more than 1 hour depending on its size, and it can be used for hot compress.

One advantage of hand warmers is that they can be recycled. Just put the hand warmer into boiling water for about 10 minutes and the condensed solute will dissolve again. This is due to the increased solubility of the solute at high temperatures. During the dissolution process, the solute undergoes an endothermic reaction and becomes a supersaturated solution again.

After we understand the principle of hand warmers, we must understand the principle of hand warmers. Only when we better understand the principle of hand warmers can we use them correctly. It can bring benefits to our lives. We must not be too careless when using hand warmers. We must keep these in mind.