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Alcohol What is alcohol? Alcohol is a compound made up of carbon, hydrogen and oxygen. It is produced when sugars are fermented by yeasts. During fermentation, the yeasts grow by feeding on the sugars (e.g. glucose) and produce alcohol and gas (carbon dioxide) as by-products. C6H12O6 2C2H5OH + 2CO2 + Energy Glucose Ethanol Carbon Dioxide Fermentation is a process which has been used for thousands of years to produce alcoholic drinks and some foods, e.g. bread and yogurt. In breadmaking the gas makes the dough rise, and the alcohol evaporates in the oven. In wine or beer making, the gas bubbles off and the amount of alcohol produced is controlled by the amount of yeast and the duration of fermentation. Fruits such as grapes and apples are commonly used to make alcoholic drinks such as wines and ciders, and cereals such as barley and rye form the basis for beers and spirits, like whisky or...

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