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 ?
To a patient who complained of intestinal gas, a reading mentioned that coffee would prevent its formation.
There is a strong association of fibromyalgia with irritable bowel syndrome (IBS), a functional bowel disorder with symptoms of alternating diarrhea and constipation, intestinal gas, bloating, distention or cramping, sensations of incomplete evacuation, and abnormal bowel urgency or frequency.
Adults, too, 35 percent of those recently surveyed, admit to liking a good joke about intestinal gas, though men still enjoy this more than women (44% vs.
Intestinal gas is one of the body's most embarrassing functions, especially when the sound isn't muffled by cheering fans and the odor is pungent.
GasBGon incorporates state-of-the-art acoustical and carbon filter technologies to muffle the sound and adsorb the odors of intestinal gas.
First, an internal acoustical foam filter discretely muffles the sound of the intestinal gas outburst.
Manufactured with the same charcoal-based material approved by the British Chemical Defense Establishment for use in chemical warfare suits protecting soldiers from nerve gas and other toxic vapors, the Flatulence Deodorizer(TM) consists of a discreet pad that absorbs odors, compensating for when intestinal gas prevention and reduction products fail.
8 /PRNewswire/ -- The weather outside is delightful, but the weather inside is frightful because one of your holiday guests suffers from excessive intestinal gas.
After all, who would not remember a present whose sole function is to discretely remove the telltale sounds and odors associated with intestinal gas outbursts?
Jim Huza, an air purification engineer and father of three, has developed GasBGon, a flatulence filter seat cushion that applies carbon filter technologies to muffle the sound and absorb the odors that accompany intestinal gas.
According to a national survey, many people with intestinal gas recognize and admit they have flatulence, and surprisingly, are not readily embarrassed.