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How many pounds are in a gallon?
A gallon is a measure of volume equal to 128 fluid ounces (fl oz). One fluid ounce of water weighs one ounce (oz). So a gallon of water weighs 128 oz, or 8 pounds.
A gallon of other liquids will vary in weight depending on the density of the liquid.
There are a couple of possible answers, depending on whether you're talking about liquid ounces, or weight ounces.
For liquids, there are 8 fluid ounces in a kitchen '1 Cup' measuring cup. That means 48 fluid ounces are the same as 6 cups, 3 pints (2 cups per pint) , or 1-1/2 quarts (two pints per quart).
For weight, there are 16 ounces in a pound. (One fluid ounce of water also weighs one weight ounce, which is the basis of the adage 'A pint's a pound, the world around', since a pint is 16 fluid ounces, and 16 fluid ounces of water, or near-water like some beer, will then weigh a pound' ).. Anyhow, in this case, 16 goes 3 times into 48 ounces, so it will weigh 3 pounds.
For metric, 2.2 pounds per kilogram, or 29.5735 milliliters per fluid ounce.
The ratio is exactly what it says... 25 cups of one to 1 cup of the other. For instance a 40:1 fuel oil mixture would be 3 ounces of oil per 1 gallon ( 128 ounces rounded to 120) of fuel
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