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From Nordan Symposia
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==Origin==
[http://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English] ''glu'', from Anglo-French, from Late Latin ''glut''-, glus; akin to [[Latin]] ''gluten'' glue
*[http://en.wikipedia.org/wiki/14th_century 14th Century]
==Definitions==
*1a : any of various strong ''adhesive'' substances; especially : a hard protein chiefly gelatinous substance that [[absorbs]] water to form a viscous solution with strong adhesive properties and that is obtained by cooking down collagenous [[materials]] (as hides or bones)
:b : a solution of glue used for sticking things [[together]]
*2: something that binds together <enough [[social]] glue…to satisfy the [[human]] [[desire]] for [[community]] — E. D. Hirsch, Jr.>
==Description==
'''Glue''' or an '''adhesive''' is any substance that, when applied to the [[surfaces]] of [[materials]], binds the surfaces together and resists [[separation]]. The term "adhesive" may be used interchangeably with ''glue'', ''cement'', ''mucilage'', or ''paste''. Adjectives may be used in conjunction with the word “adhesive” to describe properties based on the substance's [[physical]] form, its [[chemical]] form, the type of materials it is used to join, or the conditions under which it is applied.
The use of adhesives offers many [[advantages]] over other binding [[techniques]] such as sewing, welding, bolting, screwing, etc. These advantages include the [[ability]] to bind different materials together, the ability to [[distribute]] [[stress]] more efficiently across the joint, the cost effectiveness of an easily [[mechanized]] [[process]], an improvement in [[aesthetic]] [[design]], and increased design flexibility. Disadvantages of adhesive use include decreased [[stability]] at high [[temperatures]], relative [[weakness]] in bonding large objects with a small bonding surface area, and greater difficulty in separating objects during testing.
Adhesives may be found naturally or produced synthetically. The earliest use of adhesive-like substances by [[humans]] was approximately 200,000 years ago. From then until the 1900s, increases in adhesive use and [[discovery]] were relatively [[gradual]]. Only since the last century has the development of synthetic adhesives [[accelerated]] rapidly, and innovation in the field continues to the present.
The earliest use of adhesives was discovered in Italy. At this site, two stone flakes partially covered with birch-bark-tar and a third uncovered stone from the [http://en.wikipedia.org/wiki/Middle_Pleistocene_era Middle Pleistocene era] (circa 200,000 years ago) were found. This is thought to be the oldest discovered human use of tar hafted stones.[http://en.wikipedia.org/wiki/Glue]
[[Category: General Reference]]
==Origin==
[http://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English] ''glu'', from Anglo-French, from Late Latin ''glut''-, glus; akin to [[Latin]] ''gluten'' glue
*[http://en.wikipedia.org/wiki/14th_century 14th Century]
==Definitions==
*1a : any of various strong ''adhesive'' substances; especially : a hard protein chiefly gelatinous substance that [[absorbs]] water to form a viscous solution with strong adhesive properties and that is obtained by cooking down collagenous [[materials]] (as hides or bones)
:b : a solution of glue used for sticking things [[together]]
*2: something that binds together <enough [[social]] glue…to satisfy the [[human]] [[desire]] for [[community]] — E. D. Hirsch, Jr.>
==Description==
'''Glue''' or an '''adhesive''' is any substance that, when applied to the [[surfaces]] of [[materials]], binds the surfaces together and resists [[separation]]. The term "adhesive" may be used interchangeably with ''glue'', ''cement'', ''mucilage'', or ''paste''. Adjectives may be used in conjunction with the word “adhesive” to describe properties based on the substance's [[physical]] form, its [[chemical]] form, the type of materials it is used to join, or the conditions under which it is applied.
The use of adhesives offers many [[advantages]] over other binding [[techniques]] such as sewing, welding, bolting, screwing, etc. These advantages include the [[ability]] to bind different materials together, the ability to [[distribute]] [[stress]] more efficiently across the joint, the cost effectiveness of an easily [[mechanized]] [[process]], an improvement in [[aesthetic]] [[design]], and increased design flexibility. Disadvantages of adhesive use include decreased [[stability]] at high [[temperatures]], relative [[weakness]] in bonding large objects with a small bonding surface area, and greater difficulty in separating objects during testing.
Adhesives may be found naturally or produced synthetically. The earliest use of adhesive-like substances by [[humans]] was approximately 200,000 years ago. From then until the 1900s, increases in adhesive use and [[discovery]] were relatively [[gradual]]. Only since the last century has the development of synthetic adhesives [[accelerated]] rapidly, and innovation in the field continues to the present.
The earliest use of adhesives was discovered in Italy. At this site, two stone flakes partially covered with birch-bark-tar and a third uncovered stone from the [http://en.wikipedia.org/wiki/Middle_Pleistocene_era Middle Pleistocene era] (circa 200,000 years ago) were found. This is thought to be the oldest discovered human use of tar hafted stones.[http://en.wikipedia.org/wiki/Glue]
[[Category: General Reference]]
