Why is it called a fifth of liquor?

In: Liquor [Edit categories]

Answer:

alright, some liquid education for you...
4 gils to 1 pint
2 pints to 1 quart
4 quarts to 1 gallon
since a "fifth" of liquor has less liquid than a quart, than a "fifth" must be 1/5 of a gallon, right? Well, A "fifth" of liquor has 750 ml which equals 25.36 oz, which is roughly 1/5 of a gallon (128 oz).

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