How many ounces in a fifth of liquor?
Traditionally, a fifth of liquor is one fifth of a gallon or 25.6 fluid ounces. In 1979, the US changed liquor measurements to metric, and a 750 ml bottle is known as a fifth and contains 25.4 fluid ounces.
A fifth of liquor contains 25 3⁄5 US fluid ounces, which is one fifth of a gallon.
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