These are less perishable and may be stable without pasteurization. Wines are termed still or sparkling depending upon the amount of CO 2 they contain. The carbon dioxide may be formed naturally during fermentation or may be added artificially. Both table and sparkling wines tend to have alcohol contents between 7 and 14 percent . The alcohol concentration itself is not sufficient to preserve natural wines, they are pasteurized .
Grapes grow on vines.
There are many different types of grapes, but the best wine grape is the European Vitis vinifera . It is considered optimal because it has the right balance of sugar and acid to create a good fermented wine without the addition of sugar or water. At harvest time, the short-term effects of weather are quite important. Think of raisins. As the fruit dries, the water evaporates.