According to the above classification method, there will be "positive ions" when there are "negative ions", all of which are called out by ions. So what are ions? Can only be explained by scientists. In physics, we all know that matter is made up of molecules, and molecules are made up of atoms, and atoms are made up of nuclei and electrons rotating around the nuclei. An object is negatively charged when it gains electrons and positively charged when it loses them. We call the movement of positive and negative electrons ionic phenomenon, that is, positively charged objects are called positive ions and negatively charged objects are called negative ions. Negative ion technology is scientific, so it is also credible, which is why Kang Jiajia's negative ion underwear has been sold for a long time.