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Canada now usually employs the metric cup of 250 mL but its conventional cup was somewhat smaller than both American and imperial units.
1 Canadian cup = 8 imperial fluid ounce = 1/20 imperial gallon = 227.3045 millilitres
1 tablespoon = 1/2 imperial fluid ounce
1 teaspoon = 1/6 imperial fluid ounce
With the adoption of the imperial system the kilderkin was redefined to be 18 imperial gallons, which is exactly 81.82962 litres or approximately 2.890 cubic feet.