[Guest0918231]

Cups work great for certain things, such as a cup of water, sugar, flour, or peanuts. It gets difficult in other situations though, like trying to measure a cup of spinach, strawberries, or ice, because the measurement greatly varies depending on how the items are packed or arranged in the space.

[tobr]

Measuring volume is not great for flour for the same reason, it contains very different amounts of air depending on whether it’s packed or sifted.

[gindely]

Which is why most recipes say something like "1 cup of flour, sifted" - you have to measure it, then sift it.