What is the proof of a beverage that contains 120% ethanol?

To determine the proof of a beverage, it's essential to understand the relationship between ethanol content and proof. Proof is defined as twice the percentage of alcohol by volume (ABV). For instance, a beverage that contains 50% ethanol would have a proof of 100.

In this specific case, saying that a beverage contains 120% ethanol isn't feasible because the maximum concentration of ethanol in any beverage can only be 100%. Ethanol, or ethyl alcohol, cannot exceed 100% concentration in solution as it represents a complete saturation of alcohol in the liquid. Therefore, a beverage claiming to have 120% ethanol is not possible in practical terms, which is why the proof would be considered as 0.

Understanding this concept helps clarify that the measurement of ethanol is limited to a maximum of 100%, and any figure suggesting otherwise indicates an unrealistic scenario.