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[RC] The weight of water - k s swigartDiane said:
> Old saying: A pint's a pound the world around.
Except that this is only true in the US.
The Imperial pint is 20 oz (not 16) and the imperial fluid ounce is slightly smaller (but not 25% smaller) than the American one.
So yes, a US gallon of water weighs about 8 pounds (but it depends on temperature and air pressure).
The Imperial gallon, however, weighs closer to 10 pounds.
From Wikipedia:
"The Imperial (UK) gallon was legally defined as 4.546 09 litres. This definition is used in Commonwealth countries and Ireland, and is based on the volume of 10 pounds of water at 62 °F. (A U.S. liquid gallon of water weighs about 8.33 pounds at the same temperature.) "
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