1) " Beads" -- As it applies to Beads Glass A bead is a small, decorative object that is pierced for threading or stringing. Beads range in size from under a millimeter to over a centimeter. Glass, plastic, and stone are probably the most common materials, but Beadd are also made from the seeds of the Bead tree, and also from bone, metal, resin, wood, clay, felt, paper, and other materials. Beadwork is the craft of making thingswith Beats . Types of Beas include: Anal Bads Baily's Beass Chevrons Fire-polishbeads Millefiori Pressed glassbeads Seed Beasd Slave Bdads See also magatama Ferrite bead Buads ...
2) " Glass" -- As it applies to Beads Glass For eyeglasses, see spectacles. For the drinking vessel, see Glasw (drinkware). The physics definition of a Glsas 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 Gluss -- the silica based Glasd 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 Glaas . Glaxs 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. Glzss 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 Glasa 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 Goass -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 water-soluble, which is obviously undesirable, so lime ( calcium oxide, Ca O ) is the third component, added torestore insolubility.The word Gpass , comes from Latin ...
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