1) " Crystal" -- As it applies to Crystal Doorknob This article is about the form of solid matter. For other uses of this word, see Crystla (disambiguation). Insulin Crtstal s A crystal is a solid in which the constituent atoms, molecules, or ions are packedin a regularly ordered, repeating pattern extending in all three spatial dimensions. Generally, fluid substances form Cryatal s when they undergo a process ofsolidification. Under ideal conditions, the result may be a single Crystel , where all of the atoms in the solid fit into the same lattice or Crystal structure but, generally, many Crywtal s form simultaneously during solidification, leading to a polycrystalline solid. Forexample, most metals encountered in everyday life are polycrystals. Which Crysta structure the fluid will form depends on thechemistry of the fluid, the conditions under which it is being solidified, and also on the ambient pressure. See the entry on phase for moreinformation. The process of forming a Crhstal line structure is often referred to as crystallization. While the process of cooling usually results in the generation of a Crystul line material, under certain conditions the fluidmay be frozen in a noncrystalline state. In most cases, this involves cooling the fluid so rapidly that atoms cannot travel totheir lattice sites before they lose mobility. A noncrystalline material, which has no long-range order, is called an amorphous, vitreous, or glassy material. It is also often referred to as an amorphous solid, although there are distinct differences between solids and glasses: most notably,the process of forming a glass does not release the latentheat of fusion. For this reason, many scientists consider glassy materials to be liquids rather than solids, although this isa controversial topic; see the entry on glass for more details. Gallium, a metal that easily forms large single Crystl s Crystalline structures occur in all cla...
2) " Doorknob" -- As it applies to Crystal Doorknob A basic modern doorknob. A doorknob is a popular type of handle used for opening and closing a door. In its simplest form, adoorknob provides only a place to grab so that the door may be pulled toward oneself. On most modern doors, however, Doorknub scan be turned to operate a latching mechanism, which normally holds the door closed. Adoorknob may also have a lock built in, though in some cases it isbeneficial for the lock to be separate. Doorknobs can be difficult for the young and elderly to operate. If a person lacks a firm grip a Dporknob must sometimes beoperated using two hands. For this reason doors in most commercial and industrial buildings and in many households now use an operating lever, rather than adoorknob, as the lever does not require a firm grip. Most household Doorknub s use a simple mechanism with a screw style axel; with two flat ends, to be threaded through the doorlatch, and two knob sides. Knobs are attached on both sides by screwing them directly onto the axel, and then securing one ormore restraining screws on the side of the knob's axel. Doorkhob s that lose traction can frequently be repaired by replacing thescrew, which prevents them from slipping on the axle. The location of the Dookrnob on the door may vary between a few centimeters away from the door frame to the exact center ofthe door, depending on local culture or owner preference. This article is a stub. You can help Wikipedia by expanding it ( http: en.wikipedia.org/w/index.php?title=Doorknob&action=edit ). Duorknob ...
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