Why do we use cubes instead of squares to measure the volume of a rectangular prism?

Step-by-step explanation:

Because they have only two measurements, squares could not be used to determine a three-dimensional volume Squares, like the outer surface of a rectangular solid, can be used to measure surface areas.

Cubes are used to calculate volume since they are a three-dimensional space's simplest geometric division. For a rectangular solid, multiplying

H x W x D actually tells you how many cubes can be contained within that space (of the given unit of measurement).