1. A colorless, flammable hydrocarbon gas (C₄H₁₀) that is a branched isomer of butane, used as a refrigerant, propellant, and fuel.
Usage: chemistry; also called 2-methylpropane

Examples

• Isobutane is commonly used as a refrigerant in modern air-conditioning systems.
• The aerosol spray uses isobutane as a propellant to dispense the product.
• Isobutane has a lower boiling point than n-butane, making it useful in certain applications.
• Many lighter fuels contain isobutane mixed with other hydrocarbons.
• The chemical formula for isobutane is C₄H₁₀, with a branched molecular structure.