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

What is “Mass”?

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

I have a mass of 51 grams!

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.

How much mass does JUST the water have?

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

What is “Volume”?

Vs.

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

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

Yep! Both have a volume of 12 fluid ounces!

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

If the video will not load, the link is https://www.youtube.com/watch?v=4wyPPljNdK8

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

Which object is more dense? Why?

Both 100 cm3

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

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!

Increasing density

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

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

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

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

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

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

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

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