Introduction to Density

This Introduction to Density activity & project also includes:

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.

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Additional Tags


  • Comparing solid fruit and comparing liquids helps learners grasp that density is a property of all matter
  • Provides hands-on lab practice

  • Lesson plan does not provide any detail for the aim of the class discussion or for teaching how to measure volume