Second, powdered sugar is also called 10x sugar by the food industry for a reason. The granulated sugar is finely ground - you'd need a very powerful processor to do this at home, not just a standard food processor - more like a Vitamix than a Cuisinart - but you could do this at home. read more
Whatever it is, you've just shown it to be less dense than powdered sugar, but "normal" granulated sugar is more dense than powdered. – user10851 Jul 9 '14 at 11:54 This link measures that powdered sugar has 10x more water than granulated sugar. read more