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glass |
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glassTransparent or translucent substance that is physically neither a solid nor a liquid. Although glass is easily shattered, it is one of the strongest substances known. It is made by fusing certain types of sand (silica); this fusion occurs naturally in volcanic glass (see obsidian). In the industrial production of common types of glass, the type of sand used, the particular chemicals added to it (for example, lead, potassium, barium), and refinements of technique determine the type of glass produced. Types of glass include: soda glass; flint glass, used in cut-crystal ware; optical glass; stained glass; heat-resistant glass; and glasses that exclude certain ranges of the light spectrum. Blown glass is either blown individually from molten glass (using a tube up to 1.5 m/4.5 ft long), as in the making of expensive crafted glass, or blown automatically into a mould - for example, in the manufacture of light bulbs and bottles; pressed glass is simply pressed into moulds, for jam jars, cheap vases, and light fittings; while sheet glass, for windows, is made by putting the molten glass through rollers to form a ‘ribbon’, or by floating molten glass on molten tin in the ‘float glass’ process; fibreglass is made from fine glass fibres. Metallic glass is produced by treating alloys so that they take on the properties of glass while retaining the malleability and conductivity characteristic of metals. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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While it is uncertain precisely when glass making technology first emerged, glass objects are known from Egypt that are approximately 4500 years old. These units can be used to feed powdery-type materials at controlled rates in pharmaceutical and chemical plants, the food industry, glass making, tire manufacturing, steel production and any other industry that has a need to feed, meter, blend or convey minus 50 mesh materials. 21 at the base of the ski area in Ski Time Square and Torian Plum Plaza, with polka music, dancing, arts and crafts, pony rids, puppet shows, a petting zoo, German food, local beers and demonstrations of weaving, iron smithing and stained glass making. |
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