The pure hydrogen peroxide is added to water and the aqueous solution prepared is hydrogen peroxide. The chemical formula of water molecule is H2O, which contains 2 molecules of hydrogen and 1 molecule of oxygen. The chemical formula of hydrogen peroxide molecule is H2O2, which contains 2 molecules of hydrogen and 2 molecules of oxygen, 1 molecule of oxygen more than the water molecule, so the aqueous solution of hydrogen peroxide is also called hydrogen peroxide. Pure hydrogen peroxide can be mixed with water at will, and after mixing, you can get different concentrations of aqueous solutions, all called hydrogen peroxide. Hydrogen peroxide is a disinfectant solution that can be used for wound disinfection, as well as for environmental disinfection and food disinfection. The hydrogen peroxide used in medicine is an aqueous hydrogen peroxide solution with a concentration of 3%, which is often used for wound disinfection, rinsing sterilization, and also used in pentacology, such as otitis media and stomatology.