As an expert sommelier and brewer, I can provide you with a detailed answer to your question about the percentage of a Martini cocktail. The exact percentage can vary depending on the specific recipe and the amount of alcohol used, so I will give you a general idea based on the classic Martini cocktail.
The pure alcohol content of a classic Martini cocktail is primarily derived from the spirits used, typically gin or vodka. These spirits have varying alcohol by volume (ABV) percentages, usually ranging from 40% to 50%. Let's take the example of gin, which is commonly used in a Martini.
When you make a Martini, the standard serving size is around 60ml. In a classic Martini recipe, you typically use a ratio of 2 parts gin to 1 part dry vermouth. This means that you would use approximately 40ml of gin and 20ml of dry vermouth.
Now, let's calculate the alcohol content in the Martini. If the gin has an ABV of 40%, then 40ml of gin would contain 16ml of pure alcohol (40ml x 0.4 ABV). Similarly, if the dry vermouth has an ABV of around 15%, then 20ml of dry vermouth would contain 3ml of pure alcohol (20ml x 0.15 ABV).
So far, we have a total of 19ml of pure alcohol in the Martini. However, when you prepare a Martini, you also add water through stirring. This dilutes the alcohol content slightly. Typically, around 20ml of water is added through stirring, which brings the total volume of the Martini to approximately 80ml.
To calculate the final ABV of the Martini, we divide the total amount of pure alcohol (19ml) by the total volume of the Martini (80ml) and multiply by 100. This gives us an approximate ABV of 23.75% (19ml/80ml x 100).
It's important to note that these calculations are based on a classic Martini recipe and can vary depending on personal preferences and variations in the recipe. Some people may prefer a stronger Martini with more gin or vodka, while others may prefer a lighter version with less alcohol.
In my personal experience as a sommelier, I have seen variations of Martini recipes that use different spirits, such as flavored vodkas or even tequila, which can affect the alcohol percentage. Additionally, the amount of vermouth used can also vary, as some people prefer a drier Martini with less vermouth.
To summarize, the pure alcohol content of a classic Martini cocktail is approximately 19ml, which equates to an ABV of around 23.75% when approximately 20ml of water is added through stirring. However, it's important to keep in mind that these numbers can vary based on the specific recipe and personal preferences.