The US fluid ounce is a unit of volume in the US customary unit system with the symbol fl oz.
Primarily used for measuring the volume or capacity of liquids, 1 US fluid ounce is equal to 29.57353 ml. It is also equal to 1.040843 imperial fluid ounces.
1 US fluid ounce is equal to 1/16 imperial pint, 1/32 imperial quart and 1/128 imperial gallon.
The fluid ounce was originally defined by the volume taken up by one ounce of a substance. Of course this would be different depending on the density of that substance; for example England used wine whereas Scotland used water to establish this measure.
The US fluid ounce is derived from the US gallon; which was originally based on the English wine gallon (231 cubic inches).
The US dry pint is a unit of volume in the US customary system with the symbol dry pt.
1 US dry pint is equal to 1/8 of a dry gallon. This is equal to 1/2 US dry quart or 33.6003125 in³.
The dry pint was derived from the the British corn gallon which was 1/8 the standard 'Winchester' bushel or corn. This was the equivalent of 268.8 in³ when in dry form.