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).