Butane is an odorless, flammable gas. Butane is used in many common applications. Many lighters and hand-held torches use butane as fuel. Butane is used as a propellant for deodorants and other sprays, and may be used in botanical extraction. Butane may be blended with propane and used as a refrigerant, or added to fuel to increase octane.
Isobutane is an isomer of n-butane. It is commonly used a propellant, refrigerant, and feedstock for the production of other chemical compounds.