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silicone
silicone polymer in which atoms of silicon and oxygen alternate in a chain; various organic radicals, such as the methyl group, CH 3 , are bound to the silicon atoms. Silicones, which are unusually stable at extreme temperatures (both high and low), may occur as liquids, rubbers, resins, or greas...
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silicon
silicon nonmetallic chemical element; symbol Si; at. no. 14; at. wt. 28.0855; m.p. 1,410°C; b.p. 2,355°C; sp. gr. 2.33 at 25°C; valence usually +4. Silicon is the element directly below carbon and above germanium in Group 14 of the periodic table . It is more metallic in its properties...
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Silicon Valley
Silicon Valley an industrial region, approximately 20 mi (32 km) long, in the Santa Clara Valley between Palo Alto and San Jose, mainly in Santa Clara and San Mateo counties, W central Calif., where many computer manufacturing and design companies are located. Computer-software and other high-techn...
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Periodic Table of the Elements: Silicon
Periodic Table of the Elements: Silicon
Periodic Table of the Elements: Silicon
Atomic Number:
14
Atomic Symbol:
Si
Silicon
Atomic Weight:
28.0855
Electron
Configuration:
2&thi...
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microelectronics
microelectronics branch of electronic technology devoted to the design and development of extremely small electronic devices that consume very little electric power. Although the term is sometimes used to describe discrete electronic components assembled in an extremely small and compact form, it i...
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carbide
carbide any one of a group of compounds that contain carbon and one other element that is either a metal, boron, or silicon. Generally, a carbide is prepared by heating a metal, metal oxide, or metal hydride with carbon or a carbon compound. Calcium carbide, CaC 2 , can be made by heating calcium o...
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abrasive
abrasive material used to grind, smooth, cut, or polish another substance. Natural abrasives include sand , pumice , corundum , and ground quartz . Carborundum ( silicon carbide ) and alumina (aluminum oxide) are important synthetically produced abrasives. The hardest abrasives are natural or...
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breast implant
breast implant saline- or silicone-filled prosthesis used after mastectomy as a part of the breast reconstruction process or used cosmetically to augment small breasts. An implant consists of a fluid-filled, malleable pouch that is designed to mimic to the look and feel of natural breast tissue w...
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sandpaper
sandpaper abrasive originally made by gluing grains of sand to heavy paper sheets. Today sandpaper is made primarily with quartz, aluminum oxide, or silicon carbide grains, and is graded according to the size of the grains. It is used for smoothing and polishing, for removing old paint or varnish, ...
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silica
silica or silicon dioxide, chemical compound, SiO 2 . It is insoluble in water, slightly soluble in alkalies, and soluble in dilute hydrofluoric acid. Pure silica is colorless to white. It occurs in several forms and is widely and abundantly distributed throughout the earth, both in the pure st...
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