Flour weight measurement illustrates why volume-based imperial baking fails so routinely. Wheat flour is compressible, hygroscopic, and prone to settling during transit. Ambient humidity changes its weight inside the pantry, while packaging compression changes its density in the bag.
Extensive tests conducted by test kitchens such as King Arthur Baking and America's Test Kitchen demonstrate that a single cup of flour scooped directly from a bag can weigh anywhere between 130 and 160 grams. The standardized recipe standard for that same cup is 120 grams. A baker who scoops four ounces of flour using a volumetric estimate routinely introduces a 20% to 30% surplus of starch.
That accidental flour surplus absorbs precious free water from the dough. The result is dry scones, rubbery pancakes, and dense sandwich loaves. By switching from a volume guess to a target of 113.4 grams on a digital scale, the baker isolates density entirely. Whether the flour is sifted, compacted, stone-ground, or humidified, 113.4 grams remains identical down to the grain.
