The degree of beer does not mean the content of ethanol, but the concentration of wort, which is the raw material for beer production. Take the beer with 12 degree as an example, the concentration of wort extract before fermentation is12% (weight ratio). The extract in wort is a mixture of various components, mainly maltose.

The alcohol in beer is converted from maltose, so the alcohol content is lower than 12. Such as common light-colored beer, the alcohol content is 3.3-3.8%; The alcohol content of dark beer is 4-5%.

The degree of beer and the degree of liquor are two different things. The degree of liquor is its alcohol content, while the degree of beer actually refers to the wort concentration. The definition of alcohol degree refers to the volume percentage of pure ethanol (alcohol) in wine. For example, if the pure ethanol content in a wine 100 ml is 10 ml, the alcohol content of this wine is10, but the capacity increases or decreases with the temperature. It is stipulated in our country that the temperature is 20℃. That is, at 20℃, what is the pure ethanol content in 100 ml wine?