Butane is a gaseous hydrocarbon used as a fuel and propellant, typically in lighter fuels and aerosol propellants. It consists of four carbon atoms and ten hydrogen atoms (C4H10) and exists as a flammable, colorless gas at room temperature that becomes a liquid under pressure. In common usage, the term refers to the straight‑chain or branched alkanes with four carbons, often encountered as a component of LPG blends.
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