What does "proof" measure in alcoholic beverages?

"Proof" measures the amount of alcohol in an alcoholic beverage and is defined as twice the percentage of alcohol by volume (ABV). For instance, if a beverage has an ABV of 10%, its proof would be 20. This system originates from historical practices to determine the alcohol strength of spirits.

Understanding what proof represents is crucial for various reasons, such as ensuring compliance with regulations, labeling requirements, and helping consumers make informed choices related to alcohol content. It distinguishes spirits from wines and beers, which have their own methods of expressing alcohol content, typically using ABV alone.

The other options do not accurately capture the definition of proof. Sweetness, carbonation, and bitterness are attributes related to the flavor profile and sensory characteristics of beverages, but they do not relate to the measurement of alcohol content. Thus, the definition of proof as it relates to alcohol content is a foundational concept in alcoholic beverage control and regulation.