Popcorn Capacity

In maths we are learning about capacity we used popcorn to find out the capacity of a glass first we how many spoonfuls of popcorn cereals it took to fill a glass cup i guessed 16 it actually took  20 spoonfuls next we popped the popcorn  the on the oven we had to  guest how much  popcorn will fill up the cup i guessed 16 the capacity of popcorn in the cup was 12 spoonfuls.