Question

What is the equal of a dry ingredient to one cup of liquid?

Answer 1

This is a weird discussion -they are the same. The dry cups are made to allow leveling off, more convenient for dry ingredients and the liquid cups for pouring off- more convenient for liquids. When measuring water in a dry cup, there will be a small meniscus that will theoretically affect the measure very slightly, but the amount sticking to the cup will negate it and it's negligible- certainly for bread- anyway. All the discussion of weights is irrelevant. A liquid ounce of water does equal an ounce of weight, as a liter of water weighs a kilo, but it has nothing to do with how you use measuring cups.