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    The chemical composition of ordinary glass is Na2sio3, CaSiO3, SiO2 or Na2o- Cao 6siod and so on, the main ingredient is silicate complex salt, is an irregular structure of amorphous solids. Widely used in buildings, used to separate the wind light, belong to the mixture. There is also a colored glass that has been mixed with some metal oxides or salts, and tempered by physical or chemical methods. Sometimes some transparent plastic (such as poly-methyl methacrylate) is also referred to as plexiglass.Vetrosa
    For hundreds of of years, people have been thinking that glass is green and cannot be changed. It was later found that Green came from a small amount of iron in the raw material, and the compound of bivalent iron made the glass green. After the addition of manganese dioxide, the original two-valent iron into trivalent iron yellow, and the four-valent manganese is reduced to trivalent manganese is purple. optics, yellow and purple can be complementary to a certain extent, mixed together to become white light, the glass is not biased color. However, a few years later, Trivalent Manganese is continued to oxidize the air, yellow will gradually increase, so those old houses window glass will be slightly yellow.Vetrosa
    The glass is a kind of amorphous solid structure (from microscopic view, glass is also a liquid), its molecules do not like crystals in space with a long and orderly arrangement, and approximate to the liquid that has a short order. The glass retains its specific shape as a solid, unlike a liquid that flows with gravity. The molecular arrangement of glass is irregular and its molecule has statistical uniformity in space. In ideal condition, the physical and chemical properties of homogeneous glass (such as refractive index, hardness, elastic modulus, thermal expansion coefficient, thermal conductivity, conductivity, etc.) are the same in all directions.Vetrosa
    The glassy matter is usually obtained by the rapid cooling of the molten body, and from the molten state to the glassy state, during the cooling process, the viscosity increases sharply, the particles have no time to do the regular arrangement to form crystals, no crystallization latent heat is released, so the glassy matter is higher than the crystalline matter, and its energy is between the molten state and the crystalline state, which belongs to the metastable state. From the point of view of mechanics, glass is a kind of unstable high energy state, such as the trend of low energy state transformation, that is, crystallization tendency, so, glass is a metastable solid material.Vetrosa