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Ethanol is a chemical compound, a simple alcohol with the chemical formula C ₂H ₆O. Its formula can be also written as CH ₃−CH ₂−OH or C ₂H ₅−OH, and is often abbreviated as EtOH. Ethanol is a volatile, flammable, colorless liquid with a slight characteristic odor.
The use of ethanol is widespread, and more than 98% of gasoline in the U.S. contains some ethanol. The most common blend of ethanol is E10 (10% ethanol, 90% gasoline).