Alcohol (simple structure: CH3CH2OH) is a kind of alcohol, is the main component of wine, it is also known as alcohol, in some places commonly known as the fire wine. The chemical formula can also be written as C2H5OH or EtOH, Et represents ethyl. Ethanol is a flammable, commonly used fuel, solvent and disinfectant and is also used to make other compounds. Industrial alcohol contains a small amount of methanol.alcohol mainly refers to ethanol with a concentration of about 75%, and also includes other concentrations of alcohol widely used in medicine. Ethanol and methyl ether are isomers.