Isobutane is a colorless, flammable gas that is a branched-chain isomer of butane. Its chemical formula is C₄H₁₀, and it is commonly used as a fuel and refrigerant. Isobutane is produced during the refining of crude oil and is also found in natural gas. In addition to its use as a fuel, isobutane serves as a propellant in aerosol products and as a feedstock in the production of various chemicals. It is valued for its efficiency and low environmental impact compared to other hydrocarbons.