What does 45% alcohol mean on a whiskey bottle?

45% alcohol on a whiskey bottle means that the bottle contains 45% alcohol by volume (ABV). This means that 45 out of every 100 milliliters of the whiskey is pure ethanol (alcohol).

Here's a breakdown:

* ABV: Alcohol by Volume is the standard measure of the alcohol content in alcoholic beverages.

* 45% ABV: This indicates that 45% of the total volume of the whiskey is pure alcohol.

* Proof: In the United States, alcohol content is sometimes expressed in "proof." Proof is twice the ABV, so a 45% ABV whiskey would be 90 proof.

It's important to note that the higher the ABV, the stronger the whiskey will taste.