Seventh grade scientists weigh in on the concept of density. In a nutshell, they participate in the following activities:

• Measurement of the mass and volume of fruit in order to compare densities
• Measurement of the mass of oil and water in order to compare densities

You will need to prepare overflow buckets from 2-liter soda bottles so that lab groups can immerse the apple and orange for water displacement. This technique for finding volume is quite messy and requires plenty of coaching and practice in order to obtain useful data. Add it to the list in the Student Preparation section.