In one cup there are 8 ounces.
Liquid measuring cups indicate that 1 cup = 8 ounces.
But what they really mean is 1 cup of liquid = 8 fluid ounces.
For dry measurements, the rules change.
Because dry ingredients vary greatly in weight, you can't rely on the same conversion.
What is a dry measuring cup?
Dry measuring cups are used for measuring solid (dry) ingredients like flour, sugar, oats, or baking powder.
They're made from plastic, metal or porcelain and are sold in sets.
Are measuring cups accurate?
The differences could be staggering — more than 30 percent for some measuring spoons, as much as 6 percent for some dry measuring cups and more than 2 tablespoons per cup of water (about 13 percent) in at least one liquid measuring cup.