Sorry ChefLora, NOT a big difference :) For milk, water, and similar liquids, a fluid ounce IS equivalent to a weight ounce, so not to worry. "A pint's a pound the world around" remember? And a pint is 16 fluid ounces, and a pound is 16 weight ounces, so same difference as long as the fluid is water-like in density. Won't work for, say, honey.

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