What is the difference between the products weight versus liquid measure?
There is always confusion regarding ounces by weight (avoirdupois) versus ounces by volume (fluid ounces). Federal regulations require that viscous products be labeled by weight, yet recipes generally specify a quantity by volume (i.e., cups, tablespoons). The weight of products heavier or denser than water will always be more than their volume in fluid ounces. In the case of tomato sauce, the 8 oz. avoirdupois weight will be 7 oz. by fluid ounce volume. Therefore, when purchasing products, please keep in mind that a canned or bottled liquid product such as tomato sauce will contain fewer liquid ounces than the number of weight ounces that appear on the label.
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