Answer: Proof is defined as twice the alcohol (ethanol) content by volume. For example, a whisky with 50% alcohol is 100-proof whiskey. Anything 120-proof would contain 60% alcohol, and 80-proof means 40% of the liquid is alcohol.
Also know, what does 40% alcohol mean?
Beer contains between 4 and 7 percent alcohol by volume, with the average being 5 percent alcohol by volume. 12 oz. No matter how spirits are consumed, a standard serving (1.5 oz.) of 80 proof (40 percent alcohol by volume) of distilled spirits has the same amount of alcohol as standard servings of beer and wine.
What is 40% alcohol?
Another way of specifying the amount of alcohol is alcohol proof, which in the United States is twice the alcohol-by-volume number, while in the United Kingdom it is 1.75 times the number (expressed as a percentage). For example, 40% abv is 80 proof in the US and 70 proof in the UK.
How much alcohol is 40 proof?
In the definition of the United States, the proof number is twice the percentage of the alcohol content measured by volume at a temperature of 60°F (15.5°C). Therefore, "80 proof" is 40% alcohol by volume (most of the other 60% is water).