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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 ?
According to local medical sources, dozens of Palestinians suffered tear gas inhalation as the IOF suppressed the weekly protest calling for the reopening of the village's main road, which has been closed for 13 years.
376 of the injuries documented occurred in Jerusalem, with one Jerusalemite injured with live fire, 193 Jerusalemites injured with rubber-coated steel bullets, 14 Jerusalemites suffered from severe tear gas inhalation, and 168 Jerusalemites who were "assaulted and run over.
No one was injured, however many suffered from tear gas inhalation.
Deputy Director of emergency at the Red Crescent Society in Bethlehem, Mohammad Abu Rayan, said that Red Crescent crews provided treatment to 20 students, who were injured following tear gas inhalation.
Israeli soldiers, who provided protection to the settlers who came from the illegal settlement of Yitzhar, fired tear gas and rubber bullets at the Palestinians causing several cases of suffocation from gas inhalation and rubber bullet injuries.
Three people were shot by rubber bullets, six suffered from tear gas inhalation, and one person from a fall, the Red Crescent said.
Israeli occupation forces (IOF) on Friday 18 March, attacked the weekly nonviolent protest against the apartheid Wall and the illegal Israeli settlements, in Bil'in village, west of Ramallah, Kufur Qaddoum town, northern of Qalqilia, as well as in Nil'in village, causing dozens to suffer the effects of tear gas inhalation.
RAMALLAH, December 19, 2017 (WAFA) -- Dozens of students suffered from tear gas inhalation on Tuesday after Israeli forces attacked a school with teargas in the village of Deir Nizam, to the northwest of Ramallah, according to local sources.
The Israeli occupation forces (IOF) on Friday 11 March, attacked the weekly nonviolent protest against the apartheid Wall and the illegal Israeli settlements, in Bil'in village, west of Ramallah, and the weekly nonviolent protest in Al-Nabi Saleh village, causing dozens to suffer the effects of tear gas inhalation on both demonstrations.
Israeli forces also prevented ambulances from reaching the injured, and fired tear gas at them causing one ambulance driver to suffer from suffocation due to excessive gas inhalation.
NABLUS, December 11, 2017 (WAFA) - Palestinians suffocated due to tear gas inhalation during clashes that broke out with Israeli army in multiple areas in the northern West Bank district of Nablus, said medical sources.
Israeli occupation forces (IOF) attacked, on Friday, the weekly nonviolent protest against the apartheid Wall and the illegal Israeli settlements, in Bil'in village, west of Ramallah and the weekly nonviolent protest in KafrQaddoum town, causing dozens to suffer the effects of tear gas inhalation.