Gas

A gasone ofphasesmatter. Gases are, like liquids, fluids:haveabilityflowdo not resist deformation. Unlike liquids, however, unconstrained gases do not occupyfixed volume, but instead expandfill whatever spaceoccupy. The kinetic energy ingas isgreatest ofstatesmatter. Becausethis increased kinetic energy, gas atomsmolecules tendbounce offone another, more so askinetic energyincreased.

Also see Ideal gasKinetic theorygases

The term gasalso usedmean:

• Natural gas, whichabout 80% methane,varying proportionsethane, propanebutane,is used asfuel.
• Gasoline, colloquial shortening ofword.
• Laughing gas, or nitrous oxide, usedinducemaintain general anesthesia.
• Acetylene, usedwelding.
• Chemical warfare agent