The wine consists of 70 to 90% pure water. The second largest proportion is ethanol (the type of alcohol with the largest proportion), which in turn contains a large proportion of water, with an alcohol content of 7 to 15% vol. depending on the type of wine; for special wines up to 20% vol. and more. The other substances in the wine form the total extract. The water in the soil results from the amount of precipitation and any artificial irrigation. Water in the right quantity is an important prerequisite for the growth of the vine and plays an essential role in photosynthesis. It is not only the soil water that is important, but also the air humidity. The plant tissue consists of at least 80% water.