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- Rubidium (10211 bytes)
2: {| border="1" cellpadding="2" cellspacing="0" align="right...
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23: | [[Density]], [[Mohs hardness scale|Hardness]]
40: | [[van der Waals radius]]
49: | [[Oxidation state]]s ([[Oxide]]) - Technetium (32113 bytes)
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5: | colspan="2" align="center" | [[molybdenum]] – '''technetium''' – [[ruthenium...
25: | [[Density]], [[Mohs hardness scale|Hardness]]
42: | [[van der Waals radius]] - Neutron (7687 bytes)
1: <table border="1" cellspacing="0" align="right" cellpadding="2...
29: ...|thumb|150px|left|Chemistry Clipart .Clipart provided by
32: ...ta decay]]) occurs in some nuclei. Particles inside the nucleus are typically resonances between neut...
34: ...hat they are uncharged. This property of neutrons delayed their discovery, makes them very penetrating...
36: ...mes into play when the neutron comes very close indeed to an atomic nucleus. Consequently a free neutr... - Magnet (13875 bytes)
4: ...n stone". [[Magnesia]] is an area in Greece where deposits of [[magnetite]] have been discovered since...
6: ...magnet]]. Permanent magnets do not rely upon outside influences to generate their field. Electromagnet...
14: ...tween'' atoms and molecules. Without long range ordering, there is no net magnetic field because the m...
16: ... great deal of order. The greater the degree of ordering within and between domains, the greater the r...
18: Long range ordering (and the resulting strong net magnetic field)... - Screw (22059 bytes)
6: ...rmed on its surface. Its main uses are as a threaded [[fastener]] used to hold objects together, and ...
9: ...ly used throughout the [[Mediterranean]] world in devices such as [[oil]] and [[wine]] presses. Metal...
11: ... a screw-cutting [[lathe]] in [[1797]]; a similar device was patented by [[David Wilkinson]] in the [[...
15: ==Threaded fastener==
16: A screw used as a threaded fastener consists of a shaft, which may be cylin... - Architecture (13950 bytes)
1: ...from the macrolevel of [[town planning]], [[urban design]], and [[landscape architecture]] to the micr...
2: ...50px|The Leaning Tower of Pisa, Italy. Photo provided by [http://classroomclipart.com Classroom Clip A...
6: ...ernacular architecture]] today falls under this mode and still continues to be produced in many parts ...
8: ..._6598GW.jpg|thumb|Great Wall of China. Image provided by [http://classroomclipart.com Classroom Clipar...
10: ...]]s were formed by craftsmen to organize their trade. Over time the complexity of buildings and their ... - Renewable energy (27996 bytes)
1: ... Neither fossil fuels nor nuclear power are considered to be renewable. For a discussion of this, ple...
3: ... long time-scale, are exploited at rates that may deplete these resources in the near future (see: [[H...
9: ...gy use in modern societies see [[Renewable energy development]].
11: == Defining renewable ==
12: ...s energy sources that don't technically meet this definition. - Solar power (20128 bytes)
1: ...[[fossil fuels]] are realized. It is already in widespread use where other supplies of power are absen...
22: ...* Systems to close insulating shutters or move shades. <br>
28: ...er as a biofuel or fossil fuel , but some methane derives from the primeval gas cloud which formed the...
29: ...ermal gradients that are present across [[ocean]] depths to generate power. These temperature differen...
42: * '''non-focussing''' systems include solar domestic hot water systems and most photovo... - Wind power (27669 bytes)
1: ... deals mainly with the intricacies of large-scale deployment of wind turbines to generate [[electric p...
3: ...wind power over the United States. This type of undetailed map is most useful for scouting for offshor...
9: ...st of this wind energy can be found at high altitudes where continuous wind speeds of over 160 km/h (1...
11: ...are extremely complicated and relatively little understood, the basics of its origins are relatively s...
17: ...speed (cubed), the swept area (linearly), and the density of the air (linearly). - Modern architecture (3868 bytes)
1: '''Modern architecture''' is the term given to the range ...
2: ...ectly, rather than softening with ornament or facade.
4: ... and what constitutes Modern architecture itself, depending on the frame of reference of the historian...
6: == Basis for Modern architecture ==
8: ...amentally altering the way in which buildings are designed by bringing in qualities of art into archit... - Bicycle (44267 bytes)
5: ...ver one billion in the world today, bicycles provide the principal means of transportation in many reg...
7: The bicycle has impacted history considerably in both the cultural and industrial realms. ...
13: ...never existed, but were made up by [[Louis Baudry de Saunier]], a 19th century French bicycle historia...
14: ...|280px|Smartly dressed couple seated on an 1886-model bicycle for two.]]
15: ...drive mechanism, in [[1840]], which enabled the rider to lift his feet off the ground while driving th... - Propeller (12179 bytes)
1: ...sure from the forward and rear surfaces of the blades.
6: ... an inefficient angle, the inboard ends of the blade are subsumed into a streamlined spinner to reduce...
11: ...de the constant speed mechanism to reverse the blade pitch angle, and thus the thrust of the engine. ...
13: ...al to run an engine at an optimum constant independent of flight speed, setting separate requirements ...
15: ... blades also decreases the amount of work each blade is required to perform, limiting the local [[Mach... - Jet engine (22370 bytes)
1: ... the front of the engine (left of photo) prevents debris - or people - from being pulled into the engi...
4: ...ally ignited by flame in the eddy of a [[flame holder]], and burned as an atomized mixture. The [[comb...
6: ...(especially [[supersonic]] speeds) and high altitudes. On slower aircraft and those required to fly sh...
10: ...of peripheral fitted is dependent on the aircraft design application.
15: ...''', or simply '''jet''') engine, as subsequently developed, would become almost as revolutionary to a... - Global Positioning System (28209 bytes)
5: ...|satellite navigation system]] used for determining one's precise [[location]] and providing...
7: ...s controlled by the [[United States Department of Defense]] and can be used by anyone, free of charge....
8: The GPS system is divided into three segments: space, control, and user.
12: A GPS receiver decodes time signal transmissions from multiple satellit...
14: ... was launched [[November 6]], [[2004]] aboard a [[Delta II]] rocket ''(see article in External links s... - Leyden jar (3953 bytes)
1: [[image:Leydenjar.png|thumb|right|111px|Original [[capacitor]]]...
3: ... '''Leyden jar''' was the original [[capacitor]], developed in the [[18th century]] and used to conduc...
5: ==Description==
7: ...etal ball. Typical designs consist of an [[electrode]] and a plate, each of which stores an opposite c...
10: ...humb|left|222px|Leyden jars, Museum Boerhaave, Leiden [http://www.museumboerhaave.nl/]]]
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