Gas n. : An aeriform fluid; -- a term used at first by chemists as synonymous with air, but since restricted to fluids supposed to be permanently elastic, as oxygen, hydrogen, etc., in distinction from vapors, as steam, which become liquid on a reduction of temperature. In present usage, since all of the supposed permanent gases have been liquified by cold and pressure, the term has resumed nearly its original signification, and is applied to any substance in the elastic or aeriform state.

Gas n. : A complex mixture of gases, of which the most important constituents are marsh gas, olefiant gas, and hydrogen, artificially produced by the destructive distillation of gas coal, or sometimes of peat, wood, oil, resin, etc. It gives a brilliant light when burned, and is the common gas used for illuminating purposes.

Gas n. : Laughing gas.

Gas n. : Any irrespirable aeriform fluid.

Example:
Can a Gas stove be moved to stand next to a kitchen sink without any gaps in between?

Taxonomy
gas, particles, pressure, perfect gas, assumptions, models, gas particles, Real gas, velocity, gas molecules, Ideal gas, boundary layer, container, quantity, specific volume, intermolecular forces, Kinetic theory, Brownian motion.

Defination from the web:
gas is a state of matter, consisting of a collection of particles (molecules, atoms, ions, electrons, etc.) without a definite ... The particles of a gas are constantly moving in random directions and frequently collide with the walls of the container and/or each other. ...