Glass is made of quartz sand, borax, boric acid, barite, barium carbonate, limestone, feldspar, soda ash and other inorganic minerals. The main components of glass are silica and other oxides. Glass is an amorphous solid with irregular structure.
Glass is widely used in buildings for wind insulation and light transmission. It belongs to mixture. There are also colored glass mixed with oxides or salts of some metals to show color, and tempered glass prepared by physical or chemical methods. Some transparent plastics (such as polymethylmethacrylate) are sometimes called plexiglass.
Glass is neither crystalline nor amorphous, nor polycrystalline, nor mixed. The theoretical name is glassy. The characteristics of glassy state at room temperature are: short-range order, that is, in the range of several or dozens of atoms, the atoms are orderly arranged and show crystal characteristics; Long range disorder, that is, after increasing the number of atoms, becomes a disordered arrangement state, and its degree of disorder is similar to that of liquid. Macroscopically, glass is a solid substance.