Originally Posted by

**Dr Stan**
So Marv, I'm a supporter of doing away with this ridiculous inch, feet, gallons, etc system. Quick tell me a gallon of water weighs _______. No cheating by Googling the answer. On the other hand a liter of water has a mass of one kilogram. Which would be easier? Calculating the pressure of a column of water in the American/Imperial system or the metric system? Do you need to ask? If you have a given volume of a liquid, just look up the density and very quickly you can calculate the mass of the liquid.

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