gas


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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 ?
The commodity swaps are essential to the structure and the rating on each series of bonds in that the agreements hedge any difference between index-based revenues Main Street will receive from monthly natural gas sales to participants and the fixed debt service Main Street pays on the bonds.
The EU Electricity and Gas Markets Report helps you to gain insight into the development and problems and the impact of EU legislation on the energy industry.
New designs of LNG carriers are also working on diesel-fired electric motors, which will need less space on the carrier, creating more capacity, and will not require any LNG 'boil off' to power the ship, meaning that the 'boil off' gas can be returned to the cargo, increasing deliverable capacity.
What's more, the gas is locked in place under low temperatures and high pressures, which make this icy source of energy difficult to tap.
Pemex is also expected to benefit from the Mexican government's decision to boost its investment in gas production with an initial infusion of almost US$1.
A solid part would typically take about 3 min to cure, while gas assist reportedly can achieve a cycle time of 45 sec.
Entrapped gas from core or mold binders occurs when these organic materials degrade as they are exposed to the heat of the molten metal.
Basically, you've got a sponge up against a granite wall,'' said Tom Schroeder, a Gas Co.
Unlike structural foam, where gas is mixed with the resin and then injected, this procedure involves injection of the gas into the center of the flow.
Gas also can occur for any of the following reasons: Some people swallow air frequently because they have postnasal drip or chew gum.
Credit concerns are manageable and involve the utility's inherent sensitivity to weather conditions and maintenance of adequate liquidity and operating margins to meet increased capital expenditures and continued volatility in natural gas prices.
Harboring Latin America's second-largest amount of natural gas reserves at 55 trillion cubic feet, Bolivia would seem the Latin American supplier best positioned to serve the United States' future needs, especially considering U.