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All depends. Are we talking US gallons or UK gallons (they are different). Also, it matters what we are talking about, 40lb of water, molasses or engine oil of a specific gravity.

Gallons at one time were different for dry goods and liquids. The US gallon for liquids is 231 cubic inches and was the old UK wine or Queen Anne gallon. The UK gallon was standardized in 1824 so the same value was used for liquids and dry goods. This Imperial gallon was set at 277.42 cubic inches as this was the capacity of exactly 10lb of pure water at 62F. If you want a numeric value for either gallon, see www.footrule.com .

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15y ago
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13y ago

This depends on the material in the gallons. 40 pounds of water is about 5 gallons. 40 pounds of gasoline is about 7 gallons. 40 pounds of air is ... a lot of gallons.

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9y ago

341.2 pounds of water in 40 US gallons.

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Q: How many gallons are in 40 pounds?
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