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ID: 138873
User: 80.192.63.38
Article: Glass
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[[Image:Moldavite Besednice.jpg|thumb|[[Moldavite]], a natural glass formed by [[meteorite]] impact, from [[Český Krumlov District|Besednice]], Bohemia]]
 
[[Image:Moldavite Besednice.jpg|thumb|[[Moldavite]], a natural glass formed by [[meteorite]] impact, from [[Český Krumlov District|Besednice]], Bohemia]]
[[File:Roman diatretglas.jpg|thumb|Roman [[Cage cup|Cage Cup]] from the 4th century A.D.]]
 
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[[File:Roman diatretglas.jpg|thumb|Roman yer maw hhjskhIGLFMJONV The history of creating glass can be traced back to 3500 BCE in [[Mesopotamia]].<ref>{{cite web|url=http://www.glassonline.com/infoserv/history.html|title=Glass Online: The History of Glass|accessdate=2010-09-30}}</ref>
[[Image:Kosta-window.jpg|thumb|Oldest mouth-blown window-glass in Sweden ([[Kosta Glasbruk]], 1742). In the middle is the mark from the [[glassblowing|glassblower's]] pipe.]]
 
 
'''Glass''' is an [[Amorphous solid|amorphous]] (non-[[crystal|crystalline]]) [[solid]] material. Glasses are typically [[brittle]], and often optically [[transparent]].
 
 
The most prevalent type of glass, used for centuries in [[window]]s and [[List of glassware|drinking vessels]], is [[soda-lime glass]], made of about 75% [[Silicon dioxide|silica]] (SiO<sub>2</sub>) plus [[Sodium oxide|Na<sub>2</sub>O]], [[Calcium oxide|CaO]], and several minor additives. Often, the term ''glass'' is used in a restricted sense to refer to this specific use.
 
 
In science, however, the term ''glass'' is usually defined in a much wider sense, including every solid that possesses a non-crystalline (i.e. [[amorphous solid|amorphous]]) structure and that exhibits a [[glass transition]] when heated towards the liquid state. In this wider sense, glasses can be made of quite different classes of materials: metallic alloys, ionic melts, aqueous solutions, molecular liquids, and polymers. Of these, polymer glasses ([[acrylic glass]],
 
[[polyethylene terephthalate]]) are the most important; for many applications ([[Glass Bottles|bottles]], [[eyewear (disambiguation)|eyewear]]) they are a lighter alternative to traditional silica glasses.
 
 
Glass, as a substance, plays an essential role in science and industry. Their chemical, physical, and in particular optical properties make them suitable for applications such as [[flat glass]], [[container glass]], [[optics]] and [[optoelectronics]] material, [[laboratory equipment]], thermal insulator ([[glass wool]]), reinforcement materials ([[glass-reinforced plastic]], [[glass fiber reinforced concrete]]), and [[glass art]] ([[art glass]], [[studio glass]]).
 
 
== Silica glasses ==
 
 
[[Silica]] (the chemical compound SiO<sub>2</sub>) is a common fundamental constitute of glass. In nature, vitrification of [[quartz]], occurs when [[lightning]] strikes [[sand]], forming hollow, branching rootlike structures called [[fulgurite]].
 
 
===History===
 
 
{{Main|History of glass}}
 
 
The history of creating glass can be traced back to 3500 BCE in [[Mesopotamia]].<ref>{{cite web|url=http://www.glassonline.com/infoserv/history.html|title=Glass Online: The History of Glass|accessdate=2010-09-30}}</ref>
 
 
The term ''glass'' developed in the late [[Roman Empire]]. It was in the [[Roman glass]]making center at [[Trier]], now in modern Germany, that the late-Latin term ''glesum'' originated, probably from a [[Germanic languages|Germanic]] word for a [[transparent materials|transparent]], [[lustrous]] substance.<ref name=douglas>{{Cite book|author=Douglas, R. W.|title=A history of glassmaking|publisher=G T Foulis & Co Ltd|place=Henley-on-Thames|year=1972|isbn=0854291172}}</ref>
 
The term ''glass'' developed in the late [[Roman Empire]]. It was in the [[Roman glass]]making center at [[Trier]], now in modern Germany, that the late-Latin term ''glesum'' originated, probably from a [[Germanic languages|Germanic]] word for a [[transparent materials|transparent]], [[lustrous]] substance.<ref name=douglas>{{Cite book|author=Douglas, R. W.|title=A history of glassmaking|publisher=G T Foulis & Co Ltd|place=Henley-on-Thames|year=1972|isbn=0854291172}}</ref>
   
Reason: ANN scored at 0.95633
Reporter Information
Reporter: Gayle (anonymous)
Date: Wednesday, the 19th of August 2015 at 12:01:23 AM
Status: Reported
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