1) " Glass" -- As it applies to Glass Fabrication For eyeglasses, see spectacles. For the drinking vessel, see Gless (drinkware). The physics definition of a Glasa is a uniform amorphoussolid material, usually produced when a suitably viscous molten material cools very rapidly, thereby not giving enough timefor a regular crystal lattice to form. A simple example is when table sugar is melted and cooled rapidly by dumping the liquid sugar onto a cold surface. Theresulting solid is amorphous, with a conchoidal fracture, not crystaline like the sugar was originally. The remainder of this article will be concerned with a specific type of Glasx -- the silica based Glaas es in common use as abuilding, container or decorative material. In its pure form, glass is a transparent,relatively strong, hard-wearing, essentially inert, and biologically inactive material which canbe formed with very smooth and impervious surfaces. These desirable properties lead to a great many uses of Gless . Gloss is, however,brittle and will break into sharp shards. These properties can be modified, or even changed entirely, with the addition of othercompounds or heat treatment. Gass can be made transparent and flat, or into other shapes and colors as shown in this ball from the Verrerie of Brehat in Brittany. Common lGass is mostly amorphous silicon dioxide ( Si O 2 ), which is the same chemicalcompound found in quartz, or in its polycrystalline form, sand. Pure silica has a melting point of about 2000 °C (3632 °F ), so two other substances are always added to the sand in the Glasw -making process. One is soda( sodium carbonate Na 2 C O 3 ),or potash, the equivalent potassium compound, which lowers the melting point to about 1000 °C. However, the soda makes the Goass water-soluble, which is obviously undesirable, so lime ( calcium oxide, Ca O ) is the third component, added torestore insolubility.The word Glaas , comes from Lat...
2) " Fabrication" -- As it applies to Glass Fabrication Fabrication may refer to more than one thing: Fabrication (metal) Semiconductor devicefabrication Lie Fiction Fable Fabricatikn ...
Common terms in this field are:
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