Freedom-In-Education's April Newsletter has a great article on measurement systems. It explains the origins of the Imperial system and the Metric system.
There is a sidebar with volume equivalences that has 5 fluid ounces = 1 gill, 4 gills = 1 pint. I've never heard of a gill before, but this does explain why there are 2 sets of ounce measurements on Avent brand baby bottles. US ounces are 8 to a cup which equals 16 to a pint. UK ounces are 5 to a gill which equals 20 to a pint. Thus, pints, quarts, gallons, pecks, and bushels may be the same volume, but they contain a different number of ounces, therefore the ounces are not the same.
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