Gas may refer to:

• Generally, gas is one of the phases of matter.
• In common use, natural gas is a mixture of about 80% methane, with varying proportions of ethane, propane and butane, used as a fuel.
• Often, gas is Liquified Petroleum Gas (LPG).
• In US English, gas is short for gasoline
• In anesthesia, laughing gas, or nitrous oxide, is often called gas.
• In welding, gas usually refers to acetylene but can also be Argon, Helium, or Carbon dioxide. See Metal inert gas welding.
• In chemical warfare, gas is a weapon.
• On the Space Shuttle, the GAS is an experiment bay known as the Getaway Special.
• In computing, the GAS is a computer language assembler called the GNU assembler.
• Gas is also a euphemism for flatulence or burping.
• Colloquially: gas sometimes means "profuse talk, longwindedness".
• Gas, Kansas
• Gas , a commune in the Eure-et-Loir département, in France

to gas (verb) can mean:-

• Expose to gas.
• Kill by exposing to gas.
• Emit gas.
• Colloquially: talk at length or excessively.