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industrial glass

solid material that is normally lustrous and transparent in appearance and that shows great durability under exposure to the natural elements. These three properties-lustre, transparency, and durability-make glass a favoured material for such household objects as windowpanes, bottles, and lightbulbs. However, neither any of these properties alone nor all of them together are sufficient or even necessary for a complete description of glass. Defined according to modern scientific beliefs, glass is a solid material that has the atomic structure of a liquid. Stated more elaborately, following a definition given in 1932 by the physicist W.H. Zachariasen, glass is an extended, three-dimensional network of atoms that form a solid which lacks the long-range periodicity (or repeated, orderly arrangement) typical of crystalline materials

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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