Description: Sal finds the volume of a rectangular prism with labeled side lengths. Created by Sal Khan. So we want to measure our volume in terms of cubic meters. So when we want to think about how many cubic meters could fit in this box, we've already seen examples. So if you wanted the number of cubic meters that could fit in here, it's going to be six meters times 8 meters times 7 meters which is going to give you something in cubic meters.*Teacher Advisor is 100% free.