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Specific gravity is the density of a liquid relative to that of water, i.e., if the density of the liquid is 1.05 times that of water, it has a specific gravity of 1.05. In UK brewing usage, it is customary to regard the reference value for water to be 1000, so the specific gravity of the same example beer would be quoted as 1050.
The term was originally used in England and from 1816 was equal to about 1.75 times the percentage of alcohol by volume (ABV). The United Kingdom today uses ABV instead of proof. In the United States, alcohol proof is defined as twice the percentage of ABV. The definition of proof in terms of ABV varies from country to country.
A standard drink is a notional drink that contains a specified amount of pure alcohol. The standard drink is used in many countries to quantify alcohol intake. It is usually expressed as a measure of beer, wine, or spirits. One standard drink always contains the same amount of alcohol regardless of serving size or the type of alcoholic beverage.
A basic formula [4] to calculate beer strength based on the difference between the original and final SG is: A B V = 131.25 ( O G − F G ) {\displaystyle ABV=131.25(OG-FG)} The formula below [ 5 ] is an alternate equation which provides more accurate estimates at higher alcohol percentages (it is typically used for beers above 6 or 7%).
United States standard drinks of beer, malt liquor, wine, and spirits compared. Each contains about 14 grams or 17.7 ml of ethanol. A standard drink or (in the UK) unit of alcohol is a measure of alcohol consumption representing a fixed amount of pure alcohol.
The average number of people who drink as of 2016 was 39% for males and 25% for females (2.4 billion people in total). [4] Females on average drink 0.7 drinks per day while males drink 1.7 drinks per day. [4] The rates of drinking varies significantly in different areas of the world. [4]
For example, if you mix 50 ml of alcohol with 50 ml of water, you get somewhat less than 100 ml of liquid. In this case, the ABV is clearly 50% (because there are equal parts water and alcohol) but it seems to me that the calculation wouldn't be as straightforward for other percentages.
Burning wine was usually diluted with water to 24% ABV or less before drinking. It was mostly sold in taverns and was quite expensive. At the same time, the word vodka was already in use, but it described herbal tinctures (similar to Nalewka), containing up to 75% ABV, and made for medicinal purposes.