Draining strength

Definition

Bottling strength refers to the alcohol-by-volume percentage of whisky at bottling, after any dilution to the bottle. It is given as ABV (alcohol by volume) and describes the relationship between the amount of pure alcohol and the total volume of the liquid.

Typical levels

• Standard bottling: around 40% ABV.
• Cask strength: without the addition of water, typically between about 50% and 65% ABV, sometimes higher.
• Diluted variants: many products are bottled at lower strengths such as 43–46% ABV.

Calculation and notation

ABV is the percentage by volume of alcohol in the liquid. For example, one liter of whisky bottled at 40% ABV contains 0.4 liters of pure ethanol and 0.6 liters of other components.

Dilution and flavor

Adding water to the whisky lowers the ABV and changes the flavor profile. Lower ABV reduces the warmth of the alcohol and can make fruity and spicy notes stand out more clearly. Higher ABV often provides a more intense aroma and mouthfeel but can dominate the more delicate notes.

Practical considerations

• Shelf life: Whisky with higher ABV is generally more stable over time than diluted whisky, but oxidation occurs in open bottles.
• Labeling and use: Bottling strength is an important piece of information for the tasting experience and can be decisive when purchasing and pairing with food.