What is the difference in alcohol content and proof?

Alcohol Content (ABV):

* Definition: Alcohol by volume (ABV) is the percentage of pure ethanol in a beverage.

* Measurement: Expressed as a percentage, like 40% ABV.

* Example: A bottle of wine labeled "12% ABV" contains 12% pure alcohol and 88% other substances like water, sugars, and flavor compounds.

Proof:

* Definition: Proof is a measure of the alcohol content in a beverage, traditionally defined as twice the ABV.

* Measurement: Expressed as a number, like 80 proof.

* Example: A bottle of whiskey labeled "80 proof" has an ABV of 40% (80 proof divided by 2).

Key Differences:

* Units: ABV uses percentages, while proof uses a numerical scale.

* Calculation: Proof is double the ABV.

* Historical Context: Proof originally referred to a test where gunpowder was mixed with alcohol. If the mixture would still ignite, the alcohol was deemed "proof" that it was strong enough.

In Summary:

* ABV (Alcohol by Volume): Direct measure of pure alcohol content.

* Proof: An older system that represents double the ABV.

While proof is still used in the United States, ABV is the more common and internationally recognized measure of alcohol content.