What are gas?

  • (noun): A volatile flammable mixture of hydrocarbons (hexane and heptane and octane etc.) derived from petroleum; used mainly as a fuel in internal-combustion engines.
    Synonyms: gasoline, gasolene, petrol
    See also — Additional definitions below

Gas

Gas is one of the four fundamental states of matter (the others being solid, liquid, and plasma). A pure gas may be made up of individual atoms (e.g. a noble gas or atomic gas like neon), elemental molecules made from one type of atom (e.g. oxygen), or compound molecules made from a variety of atoms (e.g. carbon dioxide). A gas mixture would contain a variety of pure gases much like the air. What distinguishes a gas from liquids and solids is the vast separation of the individual gas particles. This separation usually makes a colorless gas invisible to the human observer. The interaction of gas particles in the presence of electric and gravitational fields are considered negligible as indicated by the constant velocity vectors in the image.

Read more about Gas.

Some articles on gas:

Power Transmission - Chemicals and Fuels
... artificial fuels include radioactive isotopes, wood alcohol, grain alcohol, methane, synthetic gas, hydrogen gas (H2), cryogenic gas, and liquefied natural gas (LNG) ...
Yamal Peninsula
... Yamal holds Russia's biggest natural gas reserves ... deposit is planned to be developed by the Russian gas monopolist Gazprom by 2011–2012, the Yamal project, a fact which put the future of nomadic reindeer herding at considerable risk ... An estimate of the gas reserves here is 55 trillion cubic meters (tcm), the world's biggest gas reserves and Russia's largest energy project in history ...
Gas Van
... The gas van or gas wagon (German Gaswagen Russian душегубка (dushegubka) Serbian душегупка) was an extermination method devised by Nazi Germany to kill victims of ...
Photosphere - The Sun
... photosphere is composed of convection cells called granules—cells of gas each approximately 1000 kilometers in diameter with hot rising gas in the center and cooler gas falling in the narrow ...
Orion Nebula
... the process of how stars and planetary systems are formed from collapsing clouds of gas and dust ... protoplanetary disks, brown dwarfs, intense and turbulent motions of the gas, and the photo-ionizing effects of massive nearby stars in the nebula ... There are also supersonic "bullets" of gas piercing the hydrogen clouds of the Orion Nebula ...

More definitions of "gas":

  • (noun): A fossil fuel in the gaseous state; used for cooking and heating homes.
    Synonyms: natural gas
  • (noun): A fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely.
  • (verb): Attack with gas; subject to gas fumes.
    Example: "The despot gassed the rebellious tribes"
  • (noun): The state of matter distinguished from the solid and liquid states by: relatively low density and viscosity; relatively great expansion and contraction with changes in pressure and temperature; the ability to diffuse readily; and the spontaneous tendency to become distributed uniformly throughout any container.

Famous quotes containing the word gas:

    one pale woman all alone,
    The daylight kissing her wan hair,
    Loitered beneath the gas lamps’ flare,
    With lips of flame and heart of stone.
    Oscar Wilde (1854–1900)

    When we can drain the Ocean into mill-ponds, and bottle up the Force of Gravity, to be sold by retail, in gas jars; then may we hope to comprehend the infinitudes of man’s soul under formulas of Profit and Loss; and rule over this too, as over a patent engine, by checks, and valves, and balances.
    Thomas Carlyle (1795–1881)

    Droning a drowsy syncopated tune,
    Rocking back and forth to a mellow croon,
    I heard a Negro play.

    Down on Lenox Avenue the other night
    By the pale dull pallor of an old gas light
    Langston Hughes (1902–1967)