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<p>Glass is a glassy amorphous body , the molten glass is rapidly cooled (supercooled) and formed, although solid, but the molecules do not have enough time to form crystals, still freeze in the liquid molecular arrangement status. Glass is generally transparent, brittle, airtight, and with a certain hardness of the material. The most common glass is soda-lime glass, which contains 75% silica (SiO2), sodium oxide (Na2O) prepared from sodium carbonate, and calcium oxide (CaO) and other additives. </p><p>Glass is chemically inert in its daily environment and does not work with creatures. Glass is generally insoluble in acid (exception: hydrofluoric acid reacts with glass to produce SiF4, which results in corrosion of the glass); but is soluble in strong bases such as cesium hydroxide. </p><p>Because of the transparent nature of the glass, so there are many different applications, one of the main applications is the building of the translucent material, usually in the walls of the window openings to install small pieces of glass (glass windows), but many buildings of the twentieth century Will use glass for its side of the coating, that is, glass curtain wall building, this modern glass has been the ability to break the rugged and widely used, new models to join the anti-bird impact design.</p>