Ethanol, also called ethyl alcohol, pure alcohol, grain alcohol, or drinking alcohol, is a volatile, flammable, colorless liquid. It is a psychoactive drug and one of the oldest recreational drugs. Best known as the type of alcohol found in alcoholic beverages, it is also used in thermometers, as a solvent, and as a fuel. In common usage, it is often referred to simply as alcohol or spirits.

Ethanol is a straight-chain alcohol, and its molecular formula is C₂H₅OH. Its empirical formula is C₂H₆O. An alternative notation is CH₃–CH₂–OH, which indicates that the carbon of a methyl group (CH₃–) is attached to the carbon of a methylene group (–CH₂–), which is attached to the oxygen of a hydroxyl group (–OH). It is a constitutional isomer of dimethyl ether. Ethanol is often abbreviated as EtOH, using the common organic chemistry notation of representing the ethyl group (C₂H₅) with Et.

The fermentation of sugar into ethanol is one of the earliest organic reactions employed by humanity. The intoxicating effects of ethanol consumption have been known since ancient times. In modern times, ethanol intended for industrial use is also produced from ethylene.

Ethanol has widespread use as a solvent of substances intended for human contact or consumption, including scents, flavorings, colorings, and medicines. In chemistry, it is both an essential solvent and a feedstock for the synthesis of other products. It has a long history as a fuel for heat and light, and more recently as a fuel for internal combustion engines.

Ethanol is the systematic name defined by the IUPAC nomenclature of organic chemistry for a molecule with two carbon atoms (prefix "eth-"), having a single bond between them (suffix "-ane"), and an attached -OH group (suffix "-ol"). Ethanol

Noun

ethanol (uncountable)

1. (organic chemistry) A simple aliphatic alcohol formally derived from ethane by replacing one hydrogen atom with a hydroxyl group: CH₃-CH₂-OH.
2. Specifically, this alcohol as a fuel.
   • 2010 January 26, Ted Strickland, Ohio State of the State Address, 05:25–39:

     In 2007, not one drop of ethanol was produced in Ohio. Today, four ethanol facilities in Ohio are producing two hundred and ninety-five million gallons annually.

• alcohol
• ethyl alcohol
• E1510 when used as a food additive

• Business: Energy: Renewable: Biomass: Ethanol (47)

• Running On Alcohol
  running_on_alcohol.tripod.com
  Facts and methods related to making and using ethanol as fuel.
• National Ethanol Vehicle Coalition
  e85fuel.com
  A non-profit membership organization promoting the use of 85% ethanol for transportation. News, annual report, newsletters, frequently asked questions, and a map of refueling stations.
• Ethanol On Tap.com
  ethanolontap.com
  Describes obtaining and distilling ethanol as well as its benefits.