Density is the amount of mass per unit of volume. The study of density provides an opportunity to help the student better understand how the masses of atoms differ.
A suggested way to start this topic is to have the student find the density of one rubber stopper and then three rubber stoppers. Repeat the same procedure but use three marbles and then eight marbles. This impresses the fact that the amount of matter does not affect the density of the object and can be used to distinguish objects of different sizes.
The evaluation of this topic can be the finding of density of some objects such as brass, lead, aluminum, rubber, and glass. After determining their densities,construct a bar graph to visualize their differences.
(figure available in print form)