What is proof a measurement of?

Proof is a measurement that indicates the amount of alcohol present in a beverage. Specifically, proof is defined as twice the percentage of alcohol by volume (ABV). For example, a beverage that is 50% alcohol by volume is 100 proof. This system originated in the UK and has been adopted in various forms worldwide.

Understanding proof is essential for bartenders and those in the beverage industry, as it provides a clear basis for the strength of alcoholic drinks, helping to ensure responsible serving practices and compliance with alcohol regulations. By knowing the proof, bartenders can make informed decisions about mixology and how to appropriately serve cocktails.

The other options are not relevant to the proof measurement. For instance, the volume of drink served pertains to the quantity of the beverage rather than its alcohol content. Sweetness measures the sugar content in a beverage, and the speed of drink preparation pertains to service efficiency, none of which are directly related to the concept of proof.