1. Lesson Objective:
You will be able to define density and compare the densities of objects based on their mass and volume.

2. What is “Mass”?

3. Mass:
How much “matter” is in an object.
Measured in grams (g).

4. I have a mass of 51 grams!

5. 450 g
360 g
867 g
I use this as a formative assessment and have students order the objects from least mass to greatest mass.

6. How much mass does JUST the water have?

7. 155 grams (Water + Beaker)
-51 grams (Beaker)
104 grams (Water)

8. What is “Volume”?

11. Vs.

12. Coke vs. Diet Coke:
What is the difference between regular Coke and Diet Coke? VS

13. Is the volume of a can of Coke the same as a can of Diet Coke?
Hmmm…

14. Yep! Both have a volume of 12 fluid ounces!

15. Is the mass of a can of coke the same as a can of diet coke?

16. Coke vs Diet Coke

17. Density:
Density is a measure of how much of a substance is packed into a space.
Vs.

18. Which object is more dense? Why?

19. Both 100 cm3

21. Example: Density = 45 grams = 15 g/cm3 3 cm3
For every cubic centimeter of volume, I have 15 grams of mass!

22. Density: Denser things sink. Lese dense things float.
I’m at the top so I am the least dense!
I’m at the bottom so I am the most dense!

23. Increasing density

24. What is the second most dense substance?1 2 3 4 5

25. #4! Dense things sink and #4 is second closest to the bottom!1 2 3 4 5

26. What is the second least dense substance?1 2 3 4 5

27. #2! Lower density items float and #2 is second closest to the top!1 2 3 4 5

28. What is the most dense substance?1 2 3 4 5

29. #5! Dense things sink and #5 is at the very bottom!1 2 3 4 5

30. What is the least dense substance?1 2 3 4 5

31. #1! Low density items float and #1 is at the very top!2 3 4 5