100 proof rum contains what percentage of alcohol
Alcohol proof The proof system in the United States was established around 1848 and was based on percent alcohol rather than specific gravity. 50% alcohol was defined as 100 proof.[1]
Unit of alcohol One unit of alcohol (UK) is defined as 10 millilitres (8 grams) of pure alcohol.[2][3] Typical drinks (i.e., typical quantities or servings of common alcoholic beverages) may contain 1â€“3 units of alcohol.[3]