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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 ?
Networking will be a major internal focus area for ABG from now and will lead to hosting a high-profile event in Dubai this year itself," said Labaki.
The ratings also recognize the overall financial and credit ratings of ABG.
ABG subscribes to higher principles of discipline in the implementation of a Shari'a Governance Framework at each of its subsidiaries.
ABG said its initial focus for Jones New York will be the development of its strategic positioning, enhancing core values, and rebuilding the brand to its former prominence.
Net income attributable to ABG shareholders increased by 13pc to $36m during the quarter when compared with $32m earlier.
Agasti has also announced a five-year corporate finance joint venture accord with ABG Sundal Collier covering the areas of real estate and shipping.
Adnan Ahmed Yousif, president, chief executive & board member of ABG, said, "We are very pleased with our decision to become a registered user of Bait Al Bursa.
7 February 2011 - Cheuvreux and ABG Sundal Collier have hiked their share price targets on Danish insurer Topdanmark A/S (CPH: TOP) to DKK875 from DKK825 and to DKK850 from DKK770, respectively.
Mulligan, President of ABG Print, will present at a 6 day management seminar: "Management Review of Printing Technologies and Future Trends" at the Levin Graduate Institute of International Relations and Commerce.
BANKING AND CREDIT NEWS-25 May 2010-Swedish regulator fines SEB, ABG on failure to report security transactions(C)1994-2010 M2 COMMUNICATIONS http://www.
ABG Shipyard Limited (ABG Shipyard) (BSE: 523682), a ship manufacturing and repairing company of India, is continuing to look for a controlling stake in Great Offshore Limited (Great Offshore )(BSE: 532786), an India-based integrated offshore oilfield services provider.