Measuring cups and spoons rely on volume, not weight, so variations in grain size can affect accuracy. To ensure accurate measurements, level dry ingredients and gently pack those that tend to settle.
Measuring cups and spoons measure volume, which is the amount of space an ingredient occupies. Because ingredients like salt, sugar, and sprinkles have varying grain sizes and shapes, the amount of empty space between the particles can differ. Larger grains create more air pockets, meaning a cup of coarse salt might weigh less than a cup of finely ground salt. This difference in density can lead to inaccuracies in recipes.
To combat this, proper measuring techniques are crucial. For dry ingredients, always use dry measuring cups (not liquid ones). Spoon the ingredient loosely into the cup until it's overflowing. Then, use a straight-edged utensil, like the back of a knife or a spatula, to level off the excess. This ensures you have a consistent volume of the ingredient.
For ingredients that tend to settle or pack down, like brown sugar or flour, gently fluff them up with a spoon or fork before measuring. Then, spoon the ingredient into the measuring cup and level it off. Brown sugar often needs to be lightly packed into the cup to achieve the correct measurement. The recipe will usually specify if packing is required.
For small quantities measured with spoons, the same principle applies. Spoon the ingredient into the spoon until overflowing, and then level it off with a straight edge.
For the most accurate baking, especially when precision is critical (like in bread making), consider using a kitchen scale to measure ingredients by weight instead of volume. Weight measurements are far less susceptible to variations in grain size and packing.