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- Glass (26176 bytes)
1: ...iginally, which can be seen in its [[conchoidal]] fracture.
3: The word ''glass'' comes from [[Latin]] ''glacies'' (ice) and corresponds to ...
18: ...nto other shapes and colors as shown in this ball from the [[Verrerie of Brehat]] in [[Brittany]].]]
22: ...plify]] transmitted signals by [[laser]] emission from within the glass itself.
26: Glass is sometimes created naturally from volcanic [[magma]]. This glass is called [[obs... - United States (58223 bytes)
36: established_dates = From [[Great Britain]]<br> [[July 4]], [[1776]]<br>[...
58: ...on of the Americas]], [[thirteen colonies]] split from Great Britain and formed the United States, the...
60: ... the [[Emancipation Proclamation]], mandating the freedom of all slaves in states in rebellion, though...
62: ...e U.S. acquired a number of overseas possessions, from [[Cuba]] to the [[Philippines]], though it gave...
70: ... American people. Americans enjoy [[universal suffrage]]. ''More information at the Main article: [[P... - Convection (4185 bytes)
1: ...e fluid or between the fluid and its boundary, or from the application of an external motive [[force]]...
3: ==Free and forced convection==
5: ...n heat transfer, a distinction is made between ''free'' and ''forced'' convection.
7: ''Free convection'' is convection in which motion of t...
11: ...nt]] and "rises"; while cooler material "sinks". Free convection occurs in any liquid or gas which ex... - Capacitor (29664 bytes)
9: [[Image:Dielectric.png|frame|The electrons in the molecules shift toward th...
14: :<math>C = \frac{Q}{V}</math>
32: :<math>i(t) = C \frac{dv(t)}{dt}</math>
34: The [[impedance]] in [[frequency domain]] can be written as
36: :<math>Z = \frac{1}{j \omega C} = - j X_C </math> - Wright brothers (19926 bytes)
12: ...Lilienthal's tables; but finding that the Smeaton Coefficient (a variable in the formula for lift and the formu...
17: ...arping in the first gliders, they had to keep the front and rear posts that hold up the glider unbrace...
19: ...ine. They experimented with gliders at Kitty Hawk from 1900 through [[1902]], each year constructing a...
25: ... flights were witnessed by 4 lifesavers and a boy from the village, making it arguably the first publi...
31: ...Huffman Prairie in Dayton, inviting the press and friends and neighbors. Here they completed the first... - Cadmium (10755 bytes)
175: *Due to a low [[coefficient of friction]] and very good fatigue resistance, it is u...
181: ...r [[solar cell]]s. [[HgCdTe]] is sensitive to [[infrared]].
186: ...nts|discovered]] in [[Germany]] in [[1817]] by [[Friedrich Strohmeyer]]. Strohmeyer found the new ele...
188: ...ighly toxic, the [[British Pharmaceutical Codex]] from 1907 states that [[cadmium iodide]] was used as...
194: ...tion, are produced from secondary sources, mainly from dust generated by recycling [[iron]] and [[stee... - Helium (36603 bytes)
106: ...a low [[temperature]] separation process called [[fractional distillation]].
108: ...spectroscopy | spectral line]] signature in light from a [[solar eclipse]]. Since then large reserves ...
112: ...0 [[Kelvin|K]] at 1 atmosphere) does it cool upon free expansion. Once precooled below this temperatu...
117: ...istinguish solid from liquid helium since the [[refractive index]] of the two phases are nearly the sa...
122: ...hich prevents random molecular motion ([[heat]]) from masking the atomic properties<!-- ref: ibid -->... - Screw (22059 bytes)
4: [[Image:screws.jpg|frame|Screws come in a variety of shapes and sizes f...
17: ...screw when driving it in. It also stops the screw from passing right through the material being fasten...
49: [[Image:Screw and trough.gif|frame|right|Rotating screw and fixed trough]]
50: ...ch, thread shape or cross section, coefficient of friction (static and dynamic), and holding power of ...
60: ...d in half, or friction between the bars (called ''fretting'') may weaken them. For this type of appli... - Cluster analysis (8802 bytes)
19: This method builds the hierarchy from the individual elements by progressively mergin...
53: ...er <math>u_k(x)</math>. Usually, the sum of those coefficients has to be one, so that <math>u_k(x)</math> denot...
65: ...rm{center}_k,x)}{d(\mathrm{center}_j,x)}\right)^{\frac{1}{m-1}}}</math>
69: * Assign randomly to each point coefficients for being in the clusters
70: ...t until the algorithm has converged (that is, the coefficients' change between two iterations is no more than <... - Billiards (12135 bytes)
6: ...synonyms for billiards that help distinguish them from the other billiard-like games. Although the ga...
8: ...(1). The word billiard may have evolved from the French word 'billart' which means mace, the forerunn...
10: ...all]], or [[Straight pool]]. The word pool comes from poolrooms, where people gambled off track on [[...
15: ...er specific properties such as hardness, friction coefficient and resilience are very important. Such propertie...
26: ...liards and ash for snooker. All cues are tapered from the butt to the tip. The tip of the cue is cuf... - Solvent (12764 bytes)
1: ...d to [[Extraction|extract]] [[soluble]] compounds from a mixture, the most common example is the brewi...
32: ... ether, chloroform, and many other solvents (e.g. from gasoline or glues) are used recreationally in [...
241: * [[LogP]] Partition coefficient - Radar (16746 bytes)
11: [[Electromagnetic]] waves reflect from any large change in the [[dielectric]] or diama...
13: ...nce off in a way similar to the way light bounces from a mirror. Early radars used very long [[wavelen...
15: ... and [[angle|corner]]s, in a way similar to glint from a rounded piece of [[glass]]. The most reflecti...
20: ...[Random]] polarization returns usually indicate a fractal surface like [[Rock (geology)|rock]] or [[so...
22: ...in this [[1960]] weather radar image. The radar's frequency, polarization, and receiver determine what...
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