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
Gary Gallon Gary Gallon Gary Thomas Gallon (October 1, 1945 – July 3, 2003) was a Canadian environmental activist and policy advisor. President of the Canadian Institute for Business and the Environment, and editor of "The Gallon Environment Letter", Gallon dedicated 30 years to raising environmental awareness among Canadians and inspiring environmentalists worldwide. Originally from California, Gallon came to Canada during the Vietnam War. Gallon's early forays in environmental activism included helping to found the Society Promoting Environmental Conservation (SPEC, now one of the oldest environmental organizations in British Columbia) and co-founding Greenpeace. His later moves away from heady activism into the