The difference is volume measurement vs. weight measurement. By volume, 4 oz of flour occupies a one-cup measuring cup, but 4 oz water only occupies a half-cup measuring cup. By weight, both weigh the same. Using a kitchen scale will give the most accurate measures. Thank you KAF, for always offering the option of saving/printing a recipe with measurements in ounces. (Side note to Annabelle: you mean "A cup of flour weighs about half that of a cup of water," right?)

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