Presentation on theme: "How do they work? List 5 facts or observations! Sketch a diagram."— Presentation transcript:
How do they work? List 5 facts or observations! Sketch a diagram
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
Is Water Compressible? Can you change the density of water by pushing on it?
Is Air Compressible? Can you change the density of air by pushing on it?
Is Water Compressible? No. Only air is compressible. The density of air can change.
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
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
What changes when you squeeze the bottle? (Don’t say color.) Volume Changes.
Volume Changes due to increased pressure.
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
When volume decreases, Density… 2 g/cm 3
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
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
Predict Which diver will sink first? AB
Predict Which diver will rise first? AB
Mass Volume Density = Review
1. Why does a cube of ice float in water?
Water versus Ice Water
Question 1 2 g10 g20 g Three cubes have the same volume, but very different densities. Which cube has the greatest density?
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
Review Which is denser? Both boxes have the same volume.
What is the density of the ship?
Review Which one is more likely to float in H 2 O? Both boxes have the same volume.