Many molten materials do not crystallized to their parent crystalline phases once the thermodynamic melting temperature Tm is passed on cooling. Such melts easily super cool to a temperature for below Tm and congeal to solids with out any attendant discontinuous changes in volume or entropy. These solids, which are isotropic in all their properties, are known as glass. A common misconception is that all glass has same composition. A variety of organic and inorganic material can form glass, and most of those that do exhibit a moderately sharp transition into the glassy state from the liquid. Most common inorganic glass farming system are covalent compounds of the following elements: -Si, Ge, Sn, Pb, P, As, Sb, O, S, Se, Te. The industry is growing at 12% per annum, it is not enough to keep it the float. Per capita consumption of glass in India is only 0.4 kg. Compared to 3.5 kg.in Indonesia.
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