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 glass certain steps be taken to ensure that a pint of beer is indeed a pint. Though this can be achieved using "metered dispense" (calibrated pumps), the more common solution is to use certified one-pint glasses. Until recently these had a crown stamp indicating that the certification had been done by an agency of the Crown. The number etched upon the glasses stands for the manufacturing company or site. Most pint glasses used in the United Kingdom today have actually been produced in France. Under the EU Measuring Instruments Directive (Directive 2004/22/EC), the certification of measuring instruments and devices used in