Boric acid (molecular formula: H3BO3) alias: primary boric acid, normal boric acid, is a kind of inorganic acid, white crystalline powder, with smooth feel, odorless, mainly used for disinfection, insecticidal, anti-corrosion, in nuclear power plants to control the speed of uranium nuclear fission, and to make other boron compounds. It is white powder or transparent crystal, soluble in water; Sometimes it occurs as a mineral, often dissolved in certain minerals, volcanic lakes, or hot springs.