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Cartesian Divers!

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**List 5 facts or observations!**

Cartesian Divers! How do they work? List 5 facts or observations! Sketch a diagram

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**When is it easier to make the divers sink?**

When the bottle has very little air in it. When the bottle is half-full of air. A B

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**Can you change the density of water by pushing on it?**

Is Water Compressible? Can you change the density of water by pushing on it?

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**Can you change the density of air by pushing on it?**

Is Air Compressible? Can you change the density of air by pushing on it?

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**No. Only air is compressible. The density of air can change.**

Is Water Compressible? No. Only air is compressible. The density of air can change.

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**Using density, explain why the diver floats.**

Water’s density = 1 g/cm3. The diver’s density is less than 1 g/cm3. 0.5 g/cm3 1 g/cm3

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Density = = = 0.5 g/cm3 10 g 20 cm3 As compared to water, 0.5 g/cm3 is less dense than water. It floats.

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**What changes when you squeeze the bottle? (Don’t say color.)**

Volume Changes.

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**Volume Changes due to increased pressure.**

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**Density = Mass/Volume Mass = 10 g Volume = 20 cm3 Volume = 5 cm3**

Density = 0.5 g/cm3 Density = 2 g/cm3

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When volume decreases, Density… 2 g/cm3 Increases!

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**Is the mass of the diver changed at all?**

No! Mass does not change. Volume decreases and density increases. 1 g/cm3 2 g/cm3

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**Using density, explain why the diver sinks.**

Water’s density = 1 g/cm3. The diver’s density is greater than 1 g/cm3. 1 g/cm3 2 g/cm3

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**Which diver will sink first?**

Predict Which diver will sink first? A B

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**Which diver will rise first?**

Predict Which diver will rise first? A B

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Review Mass Volume Density =

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**1. Why does a cube of ice float in water?**

Review 1. Why does a cube of ice float in water?

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Water versus Ice Water

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Question 1 Three cubes have the same volume, but very different densities. Which cube has the greatest density? 2 g 10 g 20 g

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Question 2 Three cylinders have the same volume, but very different densities. Which cylinder will displace the most water when submerged? Or will each cylinder displace the same volume of water? Same 8 g 12 g 32 g

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Review Which is denser? Both boxes have the same volume.

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**What is the density of the ship?**

0.9 g/cm3

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**Which one is more likely to float in H2O?**

Review Which one is more likely to float in H2O? Both boxes have the same volume.

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