Even Canada is SUPPOSE to be metric and we all use a combination of imperial too. The UK and Canada seem to have combined both imperial and metric...I am sure the lingo is most confusing!
http://en.wikipedia.org/wiki/Imperial_units
Saying you are 5 foot 11 inches tall, buying a "gallon of milk," having a troy ounce of silver, etc. still is understood quite well. Kilometers and miles are used interchangeably and most modern vehicles here have miles and kilometer per hour graduations on the speedometers. I tend now to know that 20C is a comfortable room temperature and water freezes at 0C and boils at 100C. That conversion part made it simpler to remember plus the weather channels/stations all report in Celsius so we HAD to get with the new program or unexpectedly freeze our buns off 'cause we shoulda bundled up by buttoning up the woolly undies--Flaps UP on the pair of red itchy Long Johns.
US gallon is 3.785 liters and the British gallon is 4.546 litres...difference of a fair bit in multiples, eh?
I'll carry two five "gallon" pails of water but buy fuel by the litre. Not sure which gallon (of water) I am using either??
So there can be three units used to measure things by...imperial, metric, and US customary...all of which don't make the
fish that got away stories any more believable--some tall tales should never actually BE measured, now should they...LOL
Tara