Pupils observe and experiment with the concept of density. This is done using a simple experiment that helps them to apply scientific principles of observation and proving a hypothesis.

Students define density in their own words. In this physics lesson plan, students calculate density using mass and volume. They explain why some objects sink and some float.

Students investigate surface tension in water. In this water molecules and surface tension lesson, students observe 3 demonstrations to show how water molecules are attracted to one another, how soap reduces the surface tension in water...