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From Nordan Symposia
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==Etymology==
[http://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English], from Anglo-French, from [[Latin]] aer, from [[Greek]] aēr
*Date: [http://www.wikipedia.org/wiki/14th_Century 14th century]
==Definitions==
*1 a archaic : [[breath]]
:b : the mixture of [[invisible]] odorless tasteless [[gases]] (as nitrogen and oxygen) that [[surrounds]] the [[earth]]
:c : a light breeze
*2 a : empty [[space]]
:b : nothingness <vanished into thin air>
:c : a sudden severance of [[relations]] <she gave me the air>
*3 [probably [[translation]] of Italian aria]
:a : tune, [[melody]]
:b Elizabethan & Jacobean [[music]] : an accompanied [[song]] or [[melody]] in usually strophic [[form]]
:c : the chief [[voice]] part or [[melody]] in choral music
*4 a : outward [[appearance]] of a [[thing]] <an air of [[luxury]]>
:b : a [[surrounding]] or pervading [[influence]] : [[atmosphere]] <an air of [[mystery]]>
:c : the look, [[appearance]], or bearing of a [[person]] especially as [[expressive]] of some [[personal]] [[quality]] or [[emotion]] : demeanor <an air of [[dignity]]>
:d : an [[artificial]] or affected [[manner]] <put on airs>
*5 : [[public]] utterance <he gave air to his [[opinion]]>
*6 : compressed air
*7 a (1) : aircraft <go by air> (2) : aviation <air safety> <air rights> (3) : air force <air [[headquarters]]>
:b (1) : the [[medium]] of [[transmission]] of radio [[waves]]; also : radio, television <went on the air> (2) : airtime
*8 : a football offense utilizing primarily the forward pass <trailing by 20 points, the team took to the air>
*9 : an air-conditioning system
*10 : the height achieved in [[performing]] an aerial maneuver <a snowboarder catching big air>; also : the maneuver itself
==Description==
'''Air''' is mainly composed of nitrogen, oxygen, and argon, which [[together]] [[constitute]] the major [[gases]] of the [[atmosphere]]. The remaining [[gases]] are often referred to as trace gases, among which are the [http://en.wikipedia.org/wiki/Greenhouse_gas greenhouse gases] such as water vapor, carbon dioxide, methane, nitrous oxide, and ozone. Filtered air includes trace amounts of many other [http://en.wikipedia.org/wiki/Chemical_compound chemical compounds]. Many [[natural]] substances may be present in tiny amounts in an unfiltered air sample, including dust, pollen and spores, sea spray, volcanic ash, and meteoroids. Various industrial [http://en.wikipedia.org/wiki/Pollutant pollutants] also may be present, such as chlorine (elementary or in compounds), fluorine compounds, elemental mercury, and sulfur compounds such as sulfur dioxide [SO2].
[[Category: Earth Science]]
==Etymology==
[http://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English], from Anglo-French, from [[Latin]] aer, from [[Greek]] aēr
*Date: [http://www.wikipedia.org/wiki/14th_Century 14th century]
==Definitions==
*1 a archaic : [[breath]]
:b : the mixture of [[invisible]] odorless tasteless [[gases]] (as nitrogen and oxygen) that [[surrounds]] the [[earth]]
:c : a light breeze
*2 a : empty [[space]]
:b : nothingness <vanished into thin air>
:c : a sudden severance of [[relations]] <she gave me the air>
*3 [probably [[translation]] of Italian aria]
:a : tune, [[melody]]
:b Elizabethan & Jacobean [[music]] : an accompanied [[song]] or [[melody]] in usually strophic [[form]]
:c : the chief [[voice]] part or [[melody]] in choral music
*4 a : outward [[appearance]] of a [[thing]] <an air of [[luxury]]>
:b : a [[surrounding]] or pervading [[influence]] : [[atmosphere]] <an air of [[mystery]]>
:c : the look, [[appearance]], or bearing of a [[person]] especially as [[expressive]] of some [[personal]] [[quality]] or [[emotion]] : demeanor <an air of [[dignity]]>
:d : an [[artificial]] or affected [[manner]] <put on airs>
*5 : [[public]] utterance <he gave air to his [[opinion]]>
*6 : compressed air
*7 a (1) : aircraft <go by air> (2) : aviation <air safety> <air rights> (3) : air force <air [[headquarters]]>
:b (1) : the [[medium]] of [[transmission]] of radio [[waves]]; also : radio, television <went on the air> (2) : airtime
*8 : a football offense utilizing primarily the forward pass <trailing by 20 points, the team took to the air>
*9 : an air-conditioning system
*10 : the height achieved in [[performing]] an aerial maneuver <a snowboarder catching big air>; also : the maneuver itself
==Description==
'''Air''' is mainly composed of nitrogen, oxygen, and argon, which [[together]] [[constitute]] the major [[gases]] of the [[atmosphere]]. The remaining [[gases]] are often referred to as trace gases, among which are the [http://en.wikipedia.org/wiki/Greenhouse_gas greenhouse gases] such as water vapor, carbon dioxide, methane, nitrous oxide, and ozone. Filtered air includes trace amounts of many other [http://en.wikipedia.org/wiki/Chemical_compound chemical compounds]. Many [[natural]] substances may be present in tiny amounts in an unfiltered air sample, including dust, pollen and spores, sea spray, volcanic ash, and meteoroids. Various industrial [http://en.wikipedia.org/wiki/Pollutant pollutants] also may be present, such as chlorine (elementary or in compounds), fluorine compounds, elemental mercury, and sulfur compounds such as sulfur dioxide [SO2].
[[Category: Earth Science]]
