Volume is the measure of the objects mass, its the amount of units needed to fill the object. This is measured in units cubed. The reason you use the units cubed is because the volume is the measure of the object being 3D. Cubes are used because they can pack together without gaps or overlapping. 3D objects are measured in cubic inches, cubic feet, or cubic yards.
Here is a good example of an object that is measured in cubic centimeters.
Try this volume game, it really helps with seeing how it works!
Surface area is the number of unit squares needed to cover the surface. When doing surface area, you have to think about each face of the object that you are figuring out the area for. when you look at an object it has two faces usually, you have to think about measuring the area of both of those sides.
Surface area formulas are also all different for each different object or shape.
When thinking about surface area, you think about laying blocks over each face of the object and counting them up, a lot like volume and area where you are trying to measure the mass of the object, in surface area you are trying to measure the outside.
Here is a good surface area game to play to help see what surface area really means.
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