1. Layering Liquids

2. Today you are going to: layer 4 unknown liquids in a straw so that none of the liquids mixes with another

3. Base: potato slice Straw: 45° angle Pipet: slowly add liquid

4. Class Discussion: What were the results?

5. Glycerin Salt water Fresh water Isopropyl alcohol

6. Clean up Carefully place potato base in trash container… dropping it will splash the food coloring out of the straws!

7. Class Discussion Why did the liquids layer that way?

8. This beaker is filled with marbles. Can I fit anymore into this space?

9. Will this salt fit in the beaker ?

10. Now there is more stuff in here than before. Can I add anything more to this space?

11. This is the same amount of space as when I started with just the marbles, but now there is a LOT more stuff in here. Jar is filled with water. It has dissolved some of the sugar at the top of the beaker.

12. Scientists have a word to describe how much stuff is in a certain amount of space ~ density density = stuff space

13. These terms don’t seem “official.” In math, what is space called? density = stuff space

14. volume density = stuff = space volume

15. What do we call stuff in science? density = stuff = space volume

16. mass Matter which has mass density = stuff = mass space volume

17. density = mass volume

18. Glycerin Salt water Fresh water Isopropyl alcohol Salt water is more dense that fresh water, because in the same volume (amount) there are dissolved salts and other substances along with the water molecules. This means there is more mass in the same volume ~ making salt water more dense.