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Ask a question: What is happening? Why?

Ask a question: What is happening? Why?. Why do these float?. Density. What is density?. Density is a ratio of how much matter there is in a certain amount of space . A measure of how many particles are packed into a certain area. More dense = more particles in a space

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Ask a question: What is happening? Why?

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  1. Ask a question:What is happening? Why?

  2. Why do these float?

  3. Density

  4. What is density? Density is a ratio of how muchmatter there is in a certain amount of space. A measure of how many particles are packed into a certain area.

  5. More dense = more particles in a space Less dense = less particles in a space

  6. How do I find density? • I need to find out how much stuff (mass) is in a certain amount of space (volume)

  7. What instruments do I need? • To find the mass of an object • Triple Beam Balance • Units are g • To find the volume of the object • Ruler or graduated cylinder • Units are cm3 or mL

  8. How do I calculate density? Density = mass OR mass ÷ volume. volume Units for density: g or g cm3 m l ALWAYS REMEMBER UNITS!

  9. Does the sample size affect the density of an object? • In other words, if I break off a piece of this cube, will it have a different density than the whole piece? • NO!!!

  10. Density is based on total mass divided by total volume. • When one changes, the other also changes, so the density (which is a ratio) stays the same!!!

  11. Which one is more dense? Which table group is most dense in the classroom? How about this: Which square is more dense?

  12. Density of Water • Water has a density of 1g/mL • If an object has a density greater than 1g/mL, it will sink in water • If an object has a density of less than 1g/mL, it will float in water.

  13. What do we know about the density of diet coke vs. coke vs. water?

  14. Do liquids have different densities? • Yes! So what happens when you mix them? • They form layers with the highest density falling to the bottom. • Alcohol = .80 g/ml • Vegetable Oil = .90 g/ml • Water = 1.0 g/ml • Salt Water = 1.2 g/ml

  15. The density of the liquid affects how you float too! • Denser liquids help you float more easily. • That is why it is easier to float in the ocean, than in a freshwater lake.

  16. Illustrating Density

  17. Metals have different densities • Lead 11.3 g/cm3 • Aluminum 2.7 g/cm3 • These are all over 1.0 g/ml and most ships are made of metal. So how do boats float?

  18. Explain why one bowling ball floats and one sinks http://www.youtube.com/watch?v=NqNGW0oOXE4

  19. Density affects many of Earth’s processes

  20. Density helps create ocean currents

  21. Density helps move melted rocks under Earth’s crust • Hot material rises, cooler material sinks, creating a current, called a Convection Current crust mantle core

  22. Solid Land has different densities • Continental Plates – lighter, thicker, made of granite • Oceanic Plates – heavier, thinner, made of basalt

  23. Convergent Boundary • Plates move toward each other The more dense oceanic plate subducts under the less dense continental plate

  24. Normal and Low bone densities • Low density bones break more easily.

  25. Temperature can affect density • Remember. . . Warm air rises. • So this means warm air is less dense than cold air and it rises

  26. Density causes your attic to be hot in the summer

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