Comparison of the imperial and US customary measurement systems adopted a system based on the 231-cubic-inch wine gallon for all fluid purposes. This became the US fluid gallon. Both the imperial and US fluid gallon are divided into 4 quarts, 8 pints or 32 gills. However, whereas the US gill is divided into 4 US fluid ounces, the imperial gill is divided into 5 imperial fluid ounces. So whilst the imperial gallon, quart, pint and gill are about 20% larger than their US fluid measure counterparts, the fluid ounce is about 4% smaller. Note that one avoirdupois ounce of water has an approximate volume of one imperial fluid ounce
Pint Latin "pincta" meaning "painted", for marks painted on the side of a container to show capacity. In the United States, the liquid pint is legally defined as one-eighth of a liquid gallon of precisely 231 cubic inches. In the United States, the dry pint is one-eighth of a dry gallon. The United States dry pint is equal to one-eighth of a United States dry gallon. It is used in the United States, but is not as common as the liquid pint. A now-obsolete unit of measurement in Scotland known as the "Scottish pint" or "joug" equals three imperial pints. It