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gas,

in physics, one of the three commonly recognized states of matter, the other two being solid and liquid. A substance in the gaseous state has neither definite shape nor definite volume. Like liquids, gases are fluids and assume the shape of their containers. Unlike liquids, they will expand to fill any container, regardless of its size. All gases condense into liquids or solids when sufficiently cooled or compressed (see compressioncompression,
external stress applied to an object or substance, tending to cause a decrease in volume (see pressure). Gases can be compressed easily, solids and liquids to a very small degree if at all.
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; condensationcondensation,
in physics, change of a substance from the gaseous (vapor) to the liquid state (see states of matter). Condensation is the reverse of vaporization, or change from liquid to gas.
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; liquefactionliquefaction,
change of a substance from the solid or the gaseous state to the liquid state. Since the different states of matter correspond to different amounts of energy of the molecules making up the substance, energy in the form of heat must either be supplied to a substance
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). Most gases first liquefy, but some pass directly into the solid state (see sublimationsublimation
, change of a solid substance directly to a vapor without first passing through the liquid state. The term is also used to describe the reverse process of the gas changing directly to the solid again upon cooling.
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); carbon dioxide, for example, can condense into dry ice. Some gases are extremely soluble in certain liquids, the liquid absorbing many times its own volume of gas. Some solids, by a process called adsorption, can take up many times their own volume of certain gases. The behavior of gases under various conditions of pressure, temperature, and volume is described by the various gas lawsgas laws,
physical laws describing the behavior of a gas under various conditions of pressure, volume, and temperature. Experimental results indicate that all real gases behave in approximately the same manner, having their volume reduced by about the same proportion of the
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. Many of the properties of gases can be understood by considering the fact that only a small part of the volume of a gas is occupied by its atoms or molecules, which are in rapid, random motion. See kinetic-molecular theory of gaseskinetic-molecular theory of gases,
physical theory that explains the behavior of gases on the basis of the following assumptions: (1) Any gas is composed of a very large number of very tiny particles called molecules; (2) The molecules are very far apart compared to their sizes,
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.

Gas

A state of matter, including natural gas and propane, used as a fuel to produce energy, generally for lighting and heating.

gas

[gas]
(materials)
(ordnance)
To expose to a war gas.
(physics)
A phase of matter in which the substance expands readily to fill any containing vessel; characterized by relatively low density.

gas

1. a substance in a physical state in which it does not resist change of shape and will expand indefinitely to fill any container. If very high pressure is applied a gas may become liquid or solid, otherwise its density tends towards that of the condensed phase
2. any substance that is gaseous at room temperature and atmospheric pressure
3. any gaseous substance that is above its critical temperature and therefore not liquefiable by pressure alone
4. 
a. a fossil fuel in the form of a gas, used as a source of domestic and industrial heat
b. (as modifier): a gas cooker
5. a gaseous anaesthetic, such as nitrous oxide
6. the usual US, Canadian, and New Zealand word for petrol, a shortened form of gasoline
7. US an informal name for flatus

gas

References in periodicals archive ?
This "coaxial" movement enhances "axial" gas transport with the returning alveolar gas traveling the airway wall towards the mouth and the central gas streaming towards terminal airways.
Continued Investments in Conventional and Unconventional Resources Ignite Growth This research service identifies the major industry challenges, market drivers and restraints, and key trends in technology and distribution for the North American valves in gas transport market.
Pols said the Netherlands and UK will be the most likely markets for the gas stored in Bergermeer as the former gas field is well connected to the gas transport network and is only 20 km away from the BBL pipeline transporting gas to the UK.
The process allows elimination of any channel designed into a part solely for gas transport.
Puliti said, "This is not only a project on the modernization of the gas transport system, but an ability to help establishing the full transparency of the Ukrainian energy sector as a whole .
Following extensive pre-commissioning and commissioning, Line 2 is scheduled to begin transporting gas toward the end of 2012 as part of a fully automated twin-pipeline gas transport system capable of transporting 55 Bcm/y from Russia to the European Union for at least 50 years.
The project includes the international marine section from the Algerian coast to the south of Sardinia near Cagliari, the Italian section comprising the land section crossing Sardinia (to the Olbia area) and a new undersea section to Tuscany (near Piombino), where the pipeline will be tied to the Italian national gas transport network.
The natural gas transport and distribution network has increased more than fourfold, raising from 1849 in 1987 to 11302 in 2009.
The overall GK3 project will allow Sonatrach to expand its gas transport capacity to 9 billion cum per year in order to provide the gas necessary to feed the future GALSI export gas line, which will connect Algeria to mainland Italy via Sardinia, as well as the new LNG train in Skikda and two power plants.
The contract was signed after agreement between PGN and state-owned oil company Pertamina, on gas transport Pertamina is one of the owners of PT Trans Java Pipeline which operates gas transmission pipe.
If Norwegian companies representing the energy sector are ready to invest in Ukraine's gas transport system, the Ukraine s Government is ready to submit a law to let not only European and US but also Norwegian companies directly invest in the Ukrainian gas transport system and underground storage facilities, Prime Minister of Ukraine Arseniy Yatsenyuk emphasized at the Norwegian-Ukrainian business forum in Kyiv on Tuesday, on November 18.