What's the name of a hot water bottle that heats up when pressing iron sheets?

The hand warmer is unstable because the concentration of supersaturated solution is too high. When a metal is twisted, a slight vibration is enough to crystallize the solute and turn it into a relatively stable solid. However, this process is exothermic, so the warm handbag begins to heat up.

One advantage of warm handbags is that they can be recycled. As long as the warm handbag is put into boiling water and heated for about 10 minutes, the condensed solute will dissolve again, because the solubility of solute will increase when the temperature rises. In the process of dissolution, the solute undergoes an endothermic reaction and becomes a supersaturated solution again.

Extended data:

1, you can dip a little detergent in a wet towel and put it on the outer layer of the hand warmer. After basic cleaning, wipe off the detergent attached to it with a clean wet towel, then wipe it with a dry towel and dry it. Avoid the power connection when wiping with a wet towel.

Most hand warmers have a closed cover at the power interface. After covering, avoid this place, pick up the power connector, protect this piece with your palm, and then gently scrub other parts of the surface with laundry detergent dipped in water; If there is no cover, put it directly at the power interface by hand and ask someone to help clean it with a soft brush. Be careful not to use too much force or wet the power connector.

3. You can buy down jacket dry cleaning agent in the market and spray it on the cloth on the outer layer of hand warmers. After four or five minutes, clean it with a wet towel, then dry it with a dry towel and dry it in the shade.

Baidu encyclopedia-hand warmer