Students measure a variety of objects using the appropriate measuring tool. In this measurement lesson plan, students explain the importance of accuracy and precision in collecting data. They discuss the difference between the two.

Mass and density — aren't they the same thing? This activity has groups use balance beams and water displacement to measure several objects. The pupils use the measurements to calculate the density of the objects. 

Groups suspend objects within layers of liquids to determine the densities of different liquids and compare them to the densities of objects calculated in Part 1. The groups then carefully test their calculations by layering the...