Gas is one of the four fundamental states of matter . A pure gas may be made up of individual atoms, elemental molecules made from one type of atom, or compound molecules made from a variety of atoms . 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.

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  1. Matter in a state intermediate between liquid and plasma that can be contained only if it is fully surrounded by a solid (or in a bubble of liquid) (or held together by gravitational pull); it can condense into a liquid, or can (rarely) become a solid directly.
  2. A chemical element or compound in such a state.
  3. A flammable gaseous hydrocarbon or hydrocarbon mixture (typically predominantly methane) used as a fuel, e.g. for cooking, heating, electricity generation or as a fuel in internal combustion engines in vehicles.
  4. A hob on a gas cooker.
  5. Methane or other waste gases trapped in one's belly as a result of the digestive process.
  6. A humorous or entertaining event or person.
  7. A fastball.

Noun (etymology 2)

  1. Gasoline; a derivative of petroleum used as fuel.
  2. gas pedal


  1. To kill with poisonous gas.
  2. To talk, chat.
  3. To emit gas.
    The battery cell was gassing.

Verb (etymology 2)

  1. To give a vehicle more fuel in order to accelerate it.
    The cops are coming. Gas it!
  2. To fill (a vehicle's fuel tank) with fuel


  1. comical, zany.
    Mary's new boyfriend is a gas man.
    It was gas when the bird flew into the classroom.

The above text is a snippet from Wiktionary: gas
and as such is available under the Creative Commons Attribution/Share-Alike License.

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