The difference between surface area and volume is pretty simple. Surface area is the sum of the areas of all the faces on an object, so if you have a 9 sided cube, you do 9*6 for the total because if you just do one side it wouldn’t be right, and a cube has 6 sides, so 9*6 is 54 units squared because Surface area is measured in units. Volume is the amount of space inside of an object. So Volume equations would be V=l x W x H, 1cm x 1cm x 1cm = 1cm cubed. Another way of thinking about the equations is that Surface area is 2-D dimensional and Volume is 3-D dimensional.