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a part is an arbitrary unit of measurement.. its more about proportions. You can substitute any unit for part.

For example, you could do 2 cups of ingredient A and 3-1/2 cups of B. Or use teaspoons. Or gallons, if you'd like. As long as you do 2 of A and 3-1/2 of B, it'll turn out just the same.

It really depends on how much you want to make.

For example:

Let's say I want you are using Vodka and Orange Juice

If you say 2 parts Vodka and 3½ parts O.J.

You could say that each part is 2 ounces.

Therefore, you would say that 2 parts is 4 ounces of Vodka and 3½ parts is 7 ounces of O.J.

You would just up the amount for larger portions. Lets say you want to make a whole gallon.

You would use cups instead of ounces. So, now we are going to go with 3 cups as a part.

So you would want to use 6 cups of Vodka and 10.5 cups of Orange Juice. This will make 16 cups or 4 quarts. With a little bit extra but, only a few ounces!

part doesn't refer to any concrete measurement, it's more in dealing with the ratio of ingredients for the drinks. This is so that one can scale a recipe up or down easily. I

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