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From Nordan Symposia
Jump to navigationJump to searchCreated page with 'File:lighterstill.jpgright|frame ==Etymology== New Latin, alteration of Latin chaos space *Date: [http://www.wikipedia.org/wiki/18th_Cen...'
[[File:lighterstill.jpg]][[File:Purplesmoke.jpg|right|frame]]
==Etymology==
New Latin, alteration of [[Latin]] [[chaos]] [[space]]
*Date: [http://www.wikipedia.org/wiki/18th_Century 1779]
==Definitions==
*1 : a [[fluid]] (as air) that has neither [[independent]] shape nor [[volume]] but tends to expand indefinitely
*2 a : a combustible gas or gaseous mixture for fuel or lighting; especially : natural gas
:b : a gaseous product of digestion; also : discomfort from this
:c : a gas or gaseous mixture used to produce anesthesia
:d : a substance that can be used to produce a [[poisonous]], asphyxiating, or irritant [[atmosphere]]
*3 : empty talk : bombast
*4 : gasoline; also : the accelerator pedal of an automotive vehicle
*5 : driving [[force]] : [[energy]] <I was young, and full of gas — H. L. Mencken> <ran out of gas in the seventh inning>
*6 slang : something that gives [[pleasure]] : delight <the party was a gas>
==Description==
'''Gas''' is one of three [[classical]] [[states]] of [[matter]]. Near [http://en.wikipedia.org/wiki/Absolute_zero absolute zero], a substance exists as a [[solid]]. As [[heat]] is added to this substance it melts into a [[liquid]] at its [http://en.wikipedia.org/wiki/Melting_point melting point] (see [[phase change]]), boils into a gas at its [http://en.wikipedia.org/wiki/Boiling_point boiling point], and if heated high enough would enter a [[plasma]] [[state]] in which the [[electrons]] are so energized that they leave their [[parent]] [[atoms]] from within the gas. A [[pure]] gas may be made up of [[individual]] [[atoms]] (e.g. a [http://en.wikipedia.org/wiki/Noble_gas noble gas] or atomic gas like neon), elemental [[molecules]] made from one type of [[atom]] (e.g. oxygen), or [http://en.wikipedia.org/wiki/Chemical_compound compound] molecules made from a variety of [[atoms]] (e.g. carbon dioxide). A gas [http://en.wikipedia.org/wiki/Mixture mixture] would contain a variety of [[pure]] gases much like the air. What distinguishes a gas from [[liquids]] and [[solids]] is the vast separation of the individual gas [[particles]]. This separation usually makes a colorless gas [[invisible]] to the [[human]] [[observer]]. The [[interaction]] of gas particles in the [[presence]] of [[electric]] and [[gravitational]] fields are considered negligible.
The gaseous [[state]] of [[matter]] is found between the [[liquid]] and [[plasma]] states, the latter of which provides the upper [http://en.wikipedia.org/wiki/Temperature temperature] boundary for gases. Bounding the lower end of the [http://en.wikipedia.org/wiki/Temperature temperature] [[scale]] lie degenerative [[quantum]] gases which are gaining increased [[attention]] these days. High-[[density]] atomic gases super cooled to incredibly low temperatures are [[classified]] by their [[statistical]] [[behavior]] as either a [http://en.wikipedia.org/wiki/Bose_gas Bose gas] or a [http://en.wikipedia.org/wiki/Fermi_gas Fermi gas].[http://en.wikipedia.org/wiki/Gas]
[[Category: Physics]]
==Etymology==
New Latin, alteration of [[Latin]] [[chaos]] [[space]]
*Date: [http://www.wikipedia.org/wiki/18th_Century 1779]
==Definitions==
*1 : a [[fluid]] (as air) that has neither [[independent]] shape nor [[volume]] but tends to expand indefinitely
*2 a : a combustible gas or gaseous mixture for fuel or lighting; especially : natural gas
:b : a gaseous product of digestion; also : discomfort from this
:c : a gas or gaseous mixture used to produce anesthesia
:d : a substance that can be used to produce a [[poisonous]], asphyxiating, or irritant [[atmosphere]]
*3 : empty talk : bombast
*4 : gasoline; also : the accelerator pedal of an automotive vehicle
*5 : driving [[force]] : [[energy]] <I was young, and full of gas — H. L. Mencken> <ran out of gas in the seventh inning>
*6 slang : something that gives [[pleasure]] : delight <the party was a gas>
==Description==
'''Gas''' is one of three [[classical]] [[states]] of [[matter]]. Near [http://en.wikipedia.org/wiki/Absolute_zero absolute zero], a substance exists as a [[solid]]. As [[heat]] is added to this substance it melts into a [[liquid]] at its [http://en.wikipedia.org/wiki/Melting_point melting point] (see [[phase change]]), boils into a gas at its [http://en.wikipedia.org/wiki/Boiling_point boiling point], and if heated high enough would enter a [[plasma]] [[state]] in which the [[electrons]] are so energized that they leave their [[parent]] [[atoms]] from within the gas. A [[pure]] gas may be made up of [[individual]] [[atoms]] (e.g. a [http://en.wikipedia.org/wiki/Noble_gas noble gas] or atomic gas like neon), elemental [[molecules]] made from one type of [[atom]] (e.g. oxygen), or [http://en.wikipedia.org/wiki/Chemical_compound compound] molecules made from a variety of [[atoms]] (e.g. carbon dioxide). A gas [http://en.wikipedia.org/wiki/Mixture mixture] would contain a variety of [[pure]] gases much like the air. What distinguishes a gas from [[liquids]] and [[solids]] is the vast separation of the individual gas [[particles]]. This separation usually makes a colorless gas [[invisible]] to the [[human]] [[observer]]. The [[interaction]] of gas particles in the [[presence]] of [[electric]] and [[gravitational]] fields are considered negligible.
The gaseous [[state]] of [[matter]] is found between the [[liquid]] and [[plasma]] states, the latter of which provides the upper [http://en.wikipedia.org/wiki/Temperature temperature] boundary for gases. Bounding the lower end of the [http://en.wikipedia.org/wiki/Temperature temperature] [[scale]] lie degenerative [[quantum]] gases which are gaining increased [[attention]] these days. High-[[density]] atomic gases super cooled to incredibly low temperatures are [[classified]] by their [[statistical]] [[behavior]] as either a [http://en.wikipedia.org/wiki/Bose_gas Bose gas] or a [http://en.wikipedia.org/wiki/Fermi_gas Fermi gas].[http://en.wikipedia.org/wiki/Gas]
[[Category: Physics]]
