Description: Word problems force us to put concepts to work using real-world applications. In this example, determine the volume of frozen water and express the answer as a fraction. Created by Sal Khan. Water, on the other hand, actually expands when it is frozen. They tell us that when it gets frozen, when it turns into ice, its volume is going to expand by 9%. So this is the original volume, 1/3 of a gallon, and it's going to expand by 9%.*Teacher Advisor is 100% free.