Possibly written by an education student, this plan involves six classic demonstrations that can be used to teach middle schoolers about density. It is not practical for teaching about pressure as the title denotes. Also, it claims that it is geared for all ages of learners, but youngsters are unlikely to comprehend the comparison of volume to mass. Materials and an estimated time are listed for each demonstration. Instructions and a brief explanation of what happens are also provided. Pick and choose, or use all of the engaging ideas in your physical or earth science curriculum. Have class members record their observations and your explanations in their science journals.