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First you need to define what you mean by gallon; an Imperial gallon is 4.546 litres, a US gallon is 3.785 litres, and a US dry gallon is 4.405 litres.

At 20oC water weighs 0.9982kg/l, so an Imperial gallon being 4.546 litres weighs 4.546 X 0.9982 = 4.538kg.

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11y ago
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9y ago

The density of seawater averages about 1.025 grams per milliliter. With conversion factors of about 3,785 milliliters per gallon and 453.6 grams per pound, this means that a gallon of seawater comes to roughly 3,879 grams or just under 8.5 pounds in weight.

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14y ago

US Gallons: 334 lb. Imperial Gallons: 400 lb.

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9y ago

The mass of 1 gallon of water is approximately 3785.41 grams. This may be expressed as 3.78541 kilograms as well.

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14y ago

8.35 pounds to the US gallon => 334 pounds

10 pounds per Imperial gallon => 400 lbs.

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10y ago

About 334 pounds for 40 US gallons.

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11y ago

About 8.35 pounds per US gallon.

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Q: How much does water weight per gallon?
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