what is the percent alcohol of 100 proof whiskey
Alcohol proof The proof system in the United States was established around 1848 and was based on percent alcohol rather than specific gravity. 50% alcohol was defined as 100 proof.[1]
Alcoholic drink The concentration of alcohol in a beverage is usually stated as the percentage of alcohol by volumeÂ  (ABV, the number of milliliters (ml) of pure ethanol in 100 ml of beverage) or as proof. In the United States, proof is twice the percentage of alcohol by volume at 60 degrees Fahrenheit (e.g. 80 proof = 40% ABV). Degrees proof were formerly used in the United Kingdom, where 100 degrees proof was equivalent to 57.1% ABV. Historically, this was the most dilute spirit that would sustain the combustion of gunpowder.
Standard drink For example, 0.35 litre glass of beer with ABV of 5.5% has 15.2 grams of pure alcohol. Pure alcohol has density of 789.24 g/l (at 20 °C).
Bourbon whiskey As of 2014, approximately 95% of all bourbon is produced in Kentucky. The state has more than 5.3 million barrels of bourbon that are aging â€“ a number that exceeds the state population.[3][34][35]