What does 1 part of alcohol mean?

Answer 1

It's a proportion. For example, if you have one part alcohol, and one part water, you have half of each.

For example, "1 part alcohol" would be a unit used when mixing fluids or powders. For example, you might want to create a cocktail that is one part alcohol and two parts Orange Juice. So, for one drink you might use 1 ounce of alcohol and 2 ounces of orange juice. For three drinks, you would use 3 ounces of alcohol and 6 ounces of orange juice.

Using the word "part" turns a recipe into a series of ratios. It makes the recipe easier to remember, since it does not use any specific units.