Cider include cider. Besides kir and snakebite, an example is Black Velvet in a version of which cider may replace champagne. Cider may also be used to make vinegar. Apple cider vinegar is noted for its high acidity and flavour. Other fruits can be used to make cider-like drinks. The most popular is made from fermented pear juice, known as perry. It is called "poiré" in France and produced mostly in Lower Normandy there. A branded sweet perry known as Babycham, marketed principally as a women's drink and sold in miniature Champagne-style bottles, was once popular but has become unfashionable. Another
Gravity (alcoholic beverage) Gravity (alcoholic beverage) Gravity, in the context of fermenting alcoholic beverages, refers to the specific gravity, or relative density compared to water, of the wort or must at various stages in the fermentation. The concept is used in the brewing and wine-making industries. Specific gravity is measured by a hydrometer, refractometer, pycnometer or oscillating U-tube electronic meter. The density of a wort is largely dependent on the sugar content of the wort. During alcohol fermentation, yeast converts sugars into carbon dioxide and alcohol. The decline in the sugar content "and" the presence of ethanol (which is appreciably less dense than