“What’s the deal with Density?” TODAY, WE WILL: Explore 3 rules of density. Watch a video to help us understand varying densities. Investigate and test the rules of density.

Let’s go on a vacation! What do we need to bring? Mass? Volume? Density?

What’s the deal with DENSITY? #1 - If you pack more mass into the same volume, an object will become MORE dense.

Airheads! Mass? Volume? Density?

What About a Coat? Will a coat become more dense if I bunch it up into a smaller volume?

#2 - If you pack the same mass into a smaller volume, an object will become MORE dense.

Think back to what you already know Think back to what you already know! Does the physical size of an object affect that objects’ density? The aquarium experiment part 1! A pumpkin gourd vs. a paperclip Mass? Volume? Density?

#3 – Just because an object has MORE mass, does NOT mean it is denser.

Let’s Summarize! Volume – the amount of space an object takes up Mass – the amount of “stuff” in an object #1 – If you pack more mass into the same volume, an object will become MORE dense. #2 – If you pack the same mass into a smaller volume, an object will become MORE dense. #3 – Just because an object has MORE mass, does NOT mean it is denser.

I Density! D=M÷V or D=M V Now Write the Formula! Now Illustrate! Use the video you just watched to draw HIGH and LOW density examples within the SAME VOLUME Now Write the Formula! I Density! D=M÷V or D=M V

“What’s the Deal with Density?” Let’s Try It on Our Own! “What’s the Deal with Density?”

How do these 3 rules relate to the Earth’s layers How do these 3 rules relate to the Earth’s layers? How does a solid float on top of a liquid? Let’s do some math to figure this out! If I wanted to find the density of 100 ml of water, how would I do it?

Data Chart: Liquid # Mass of 100 ml Volume Density in g/ml (Mass/volume) 1   2 3 4 5 6 7 8 Ex. Green/Water 100g 1 g/ml

Look at the 8 liquids on my front table Look at the 8 liquids on my front table. Your first challenge will be to find the liquids’ density, one at a time. We just did the green water together. After solving this math, your group needs to figure out which liquid will float on top of the other liquids, based on our 3 principles of density. Label & color! We will create and test a class hypothesis.

Procedure: 1) Have the material manager get a tray with a balance and a calculator on it, as well as your first liquid. 2) Take turns being the leader and get one cup at a time from each station #1-7 . They all have a volume of 100 ml. Follow the directions on your lab sheet. Record your data and use the calculator to help with your math. When done with each liquid, pick a new leader and return the liquid to the station. Pick up a new liquid from the next station to test. 3) When done with all seven liquids, create a group hypothesis on the order of the liquids densities if we poured them into a bottle. Color and label them neatly. 4) Complete your summary!

In Summary:

Real-World Connections: Summarize!

What is the best Estimate of the densities of the various layers of Earth? Continental Crust: 2.6-2.8 g/cm Oceanic Crust: 3.0-3.5 Mantle: (Avg of 3 layers) 4.5-10 Outer Core (fluid): 10.7-12 Inner Core (solid): 13.5