I'm making a simple syrup with equal parts sugar and water in a glass measuring cup and want to avoid dirtying two measuring cups.    I want to measure one (say standard table sugar,) then add the water.  What should the resulting volume of both be? 
My experiment with table sugar, pouring 1/2 cup of table sugar into a glass container then pouring in 1/2 cup of water on top without stirring resulted in the water line reaching the 3/4 cup mark after a few seconds of absorption.  So the ratio of the volume of separated sugar and water to the mixture is 3:4. 