What liquid you’re measuring determines the number of fluid ounces in a pound. Olive oil, for example, weighs 0.95 pounds for 16 fluid ounces. Water weights 1.04 pounds per cubic foot.
A fluid ounce is a volume measurement unit. A pound is a weight measurement unit. As a result, until the measured liquid is known, the question of how many fluid ounces are in a pound is useless.
Because one liquid is more dense than another, the same volume of one liquid will weigh more. Water is denser than oil in the case of water and oil. As a result, 16 fluid ounces of water weigh 1.04 pounds, whereas 16 ounces of oil weigh only 0.95 pounds. Mercury weights more than 14 pounds per cubic metre.
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