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 ?
Talk to your doctor if your gas or gas pains are so persistent or severe that they interfere with your ability to function well in daily life.
According to him 'amidst the growing global trend in gas production and utilisation, the expectation for the gas sector in Nigeria is high and provides opportunities for investment in the sector.
* Analysis of factors influencing natural gas import in China from 2019 to 2023
The committee submitted its report to Prime Minister Imran Khan, who in a high level meeting directed the gas companies on Tuesday to reimburse the additional money received from these gas consumers.
The prime minister was informed that the Rs 50 billion stolen gas was being put in the category of unaccounted for gas and the burden of stolen or wasted gas was passed on to the consumers.
The spokesperson had asserted that SNGL would overcome the gas crises as imported liquefied natural gas (LNG) would be injected in the system by Saturday night.
The PM has ordered the inquiry over the alleged negligence and incompetence of the gas companies bosses in tackling the issue and concealing facts about the fault in gas compressors that resulted in low gas pressure across the country.
He revealed that as many as 13 per cent gas were being stolen from the system which causes losses worth Rs26 billion annually.
ALL-REQUIREMENT, UNCONDITIONAL GAS SUPPLY CONTRACTS: The Gas Authority provides all-requirements gas supply to 80 municipal gas distribution systems (members) pursuant to long-term gas supply contracts, including take-or-pay supplemental contracts, which obligate the members to pay all costs related to the Gas Portfolio IV Project (Project IV) and Gas Portfolio III Project (Project III), on an absolute and unconditional take-or-pay basis.
Because natural gas has no smell but an artificial odor is added to both gas lines and tanks so that leaks can be detected quickly.
It's therefore essential your appliances are tested regularly to ensure they are Gas Safe.
The gas company specifies in a statement that it has concluded the first stage of the upgrade of the existing gas grid interconnection, installing valves which allow the reverse flow of natural gas, according to reports of investor.bg.