1) " Glass" -- As it applies to Glass Thickness For eyeglasses, see spectacles. For the drinking vessel, see Glaas (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 Glsas -- the silica based Glsas 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 Glaxs . Glsas 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. Glasx 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 Glass 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 Gliss -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 Glzss water-soluble, which is obviously undesirable, so lime ( calcium oxide, Ca O ) is the third component, added torestore insolubility.The word Glasa , comes from La...
Common terms in this field are:
Glass Lavatory, Glass Lantern, Glass Fabrication, Givenchy Perfume, Givenchy Makeup, Givenchy Cologne, Giorgio Armani Acqua Di Gio, Gift Sacks, Gibson Guitar Parts, Ghana Youth, Gentle Dental, General Electric Cooktop, Ged Exam, Ged Education, Ge Profile Refrigerators, Gb Tech, Gas Strut, Gas Chromatography And Mass Spectrometry, Garmin Gpsmap 168 Sounder, Garmin Gps 76
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