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

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Presentation on theme: "How do they work? List 5 facts or observations! Sketch a diagram."— Presentation transcript:

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

3 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. AB

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

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

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

7 Using density, explain why the diver floats. Water’s density = 1 g/cm 3. The diver’s density is less than 1 g/cm3. 1 g/cm 3 0.5 g/cm 3

8 Density = = = 0.5 g/cm 3 As compared to water, 0.5 g/cm3 is less dense than water. It floats. 10 g 20 cm 3

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

10 Volume Changes due to increased pressure.

11 Mass = 10 g Volume = 20 cm 3 Volume = 5 cm 3 Density = 0.5 g/cm 3 Density = 2 g/cm 3 Density = Mass/Volume

12 When volume decreases, Density… 2 g/cm 3

13 Is the mass of the diver changed at all? No! Mass does not change. Volume decreases and density increases. 2 g/cm 3 1 g/cm 3

14 Using density, explain why the diver sinks. Water’s density = 1 g/cm 3. The diver’s density is greater than 1 g/cm3. 2 g/cm 3 1 g/cm 3

15 Predict Which diver will sink first? AB

16 Predict Which diver will rise first? AB

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18 Mass Volume Density = Review

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

20 Water versus Ice Water

21 Question 1 2 g10 g20 g Three cubes have the same volume, but very different densities. Which cube has the greatest density?

22 Question 2 12 g 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? 32 g 8 g

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

24 What is the density of the ship?

25 Review Which one is more likely to float in H 2 O? Both boxes have the same volume.


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