• noun any solid with a noncrystalline structure
  • noun a substance made from sand and soda or lime, usually transparent and used for making windows, bottles and other objects
  • A hard, amorphous, and usually brittle and transparent substance composed of silica combined with other substances. To prepare a glass, all materials are fused at a high temperature, then cooled in a manner that prevents crystallization. flint glass, for instance, contains silica, lead oxide, and potassium carbonate. Depending on the desired properties, any of various substances may be added. For example, added boron provides more thermal and electrical resistance, barium increases the refractive index, and cerium increases the absorption of infrared rays.

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