This is a FULL 5E learning sequence to explore density of solids, irregular shapes, and fluids. This activity includes a 16 page student activity guide and 6 lesson lesson slides that you can fully edit for your class needs and preference. These are the sequencing of the lessons in this phenomena: Lesson 1 -ENGAGE- Why do hot air balloons rise into the sky? Lesson 2 - EXPLORE - How can you design an experiment to prove that air has mass? Lesson 3 - EXPLAIN/EXPLORE - What is density and how can