Gourt > Business > Chemicals > Basic Chemicals > Gases (7)
A gas is one of the four main phases of matter (after solid and liquid, and followed by plasma), that subsequently appear as a solid material is subjected to increasingly higher temperatures. Thus, as energy in the form of heat is added, a solid (e.g. ice) will first melt to become a liquid (e.g. water), which will then boil or evaporate to become a gas (e.g. water vapor). In some circumstances, a solid (e.g. "dry ice") can directly turn into a gas: this is called sublimation. If the gas is further heated, its atoms or molecules can become (wholly or partially) ionized, turning the gas into a plasma.
Physics
In the gas phase, the atoms or molecules constituting the matter basically move independently, with no forces keeping them together or pushing them apart. Their only interactions are rare and random collisions. The particles move in random directions, at high speeds, whose range is dependent on the temperature and defined by the Maxwell-Boltzmann distribution. Therefore, the gas phase is a completely disordered state. Following the second law of thermodynamics, gas particles will immediately diffuse to homogeneously fill any shape or volume of space that is made available to them.
The thermodynamic state of a gas is characterized by its volume, its temperature, which is determined by the average velocity or kinetic energy of the molecules, and its pressure, which is determined by the average velocity and density or number of molecules. These variables are related by the fundamental gas laws, which state that the pressure in an ideal gas is proportional to its temperature and number of molecules, but inversely proportional to its volume.
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Senado aprova projeto que torna lei meta de redução de gases do efeito estufa http://bit.ly/7VTK7V
g1politica (G1 - PolÃtica) Wed, 25 Nov 2009 22:02:03 -0000
Senado aprova projeto que torna lei meta de redução de gases do efeito estufa http://bit.ly/7VTK7V
Senado aprova projeto que torna lei meta de redução de gases do efeito estufa http://bit.ly/7wntpH
parlamentares (Parlamentares) Wed, 25 Nov 2009 22:01:38 -0000
Senado aprova projeto que torna lei meta de redução de gases do efeito estufa http://bit.ly/7wntpH
RT @MiriamLeitaoCom: Pela primeira vez os EUA anunciaram formalmente metas de redução de gases de efeito estufa. http://bit.ly/7bQTXJ
GreenBrazil (Brazil Environ News) Wed, 25 Nov 2009 21:55:43 -0000
RT @MiriamLeitaoCom: Pela primeira vez os EUA anunciaram formalmente metas de redução de gases de efeito estufa. http://bit.ly/7bQTXJ
#R7 Senado aprova projeto que torna lei meta de redução de gases do efeito estufa: Decreto presidencial vai .. http://bit.ly/7wntpH
novanota (Nova nota) Wed, 25 Nov 2009 21:52:09 -0000
#R7 Senado aprova projeto que torna lei meta de redução de gases do efeito estufa: Decreto presidencial vai .. http://bit.ly/7wntpH
EUA vão propor corte de 17% na emissão de gases até 2020 http://twurl.nl/gxoddf
hojeemdians (Hoje em Dia News) Wed, 25 Nov 2009 21:51:52 -0000
EUA vão propor corte de 17% na emissão de gases até 2020 http://twurl.nl/gxoddf
Senado aprova projeto que torna lei meta de redução de gases do efeito estufa http://twurl.nl/jhhkz2
hojeemdians (Hoje em Dia News) Wed, 25 Nov 2009 21:51:13 -0000
Senado aprova projeto que torna lei meta de redução de gases do efeito estufa http://twurl.nl/jhhkz2
Technical Gases Ltd. - Manufactures high purity gases and gas mixtures in high pressure and disposable containers.
Meta Description: [ Manufactures high purity gases and gas mixtures in high pressure and disposable containers ]
ACP - European producer of bulk carbon dioxide, offering bulk liquid, cylinder, and dry ice forms. Includes technical information and specifications.
Meta Description: [ CO2 ACP, the total CO2 service, Europese producent van de hoogste kwaliteit aan koolzuur, combineert ervaring en dynamisme met de modernste technologie voor de productie en aanwending van CO2. ]
American Gas Group - A manufacturer, importer, exporter and worldwide distributor of specialty, rare, industrial and liquid gas products including supplies, hardware and equipment for the compressed gas and welding industries. Toledo, Ohio U.S.A.
Meta Description: [ American Gas Group ( Specialty Gases of America, American Rare Gases and American Industrial Gases ) is a ISO 9001:2000 certified manufacturer, importer, exporter and worldwide distributor of specialty, rare, industrial, liquid and medical air gas products including supplies, hardware and equipme... ]
Dominion Technology Gases - Supplier of industrial, specialty, laboratory, saturation diving and cryogenic gases.
500
Hong Kong Specialty Gases - Distributor and manufacturer of specialty gases and gaseous chemicals and associated equipment, supplying Hong Kong and China.
Industrial Gas Suppliers Alliance - Cooperative association of regional suppliers in the US offering gases and welding equipment. List of members by state, brief product overviews.
Meta Description: [ Industrial Gas Suppliers Alliance ]
SOL Group - An Italian based multinational company offering production, distribution and sales of industrial, medical and food gases and related products.
Tech Air - Provider of industrial, medical, and specialty gases, gas handling and cryogenic equipment, welding equipment and supplies in New York and Connecticut, USA.
Meta Description: [ Tech Air has been a leading provider of industrial, medical, and specialty gases,
equipment and supplies since 1935. ]
Welco-CGI Gas Industries - Supplier of gases and related equipment and services in the US Northeast. Products include specialty gases, industrial welding gases and supplies, medical and beverage gases, and helium.
Meta Description: [ Welco-CGI Gas Technologies is a joint venture between Welco Gases, CGI Industries
and Praxair Distribution Incorporated (PDI). This enterprise emerged as a powerhouse
supplier of gases and related equipment in the Northeast. Our mission is to provide
global resources with local attention. ]
www.accurategasco.com - Supplier of specialty gases for research, analytical, medical, and calibration as well as supplier of process chemicals used in manufacturing processes.
Meta Description: [ Accurate Gas is proud to offer the highest quality calibration gas products available at an affordable price. Please contact us for a price quote or with any questions you may have concerning your calibration gas requirements. ]
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