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Volume and Density

Volume and Density. **Everything in red should go in your notes!. What is Volume?. Volume is the amount of space occupied by an object. OR The amount of space something takes up. Which one has more volume?. Equation for volume. We can find the volume of an object two ways. First way:

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Volume and Density

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  1. Volume and Density **Everything in redshould go in your notes!

  2. What is Volume? • Volume is the amount of space occupied by an object. OR • The amount of space something takes up.

  3. Which one has more volume?

  4. Equation for volume • We can find the volume of an object two ways. • First way: • Length x width x height • Second Way: • How much water gets displaced in a graduated cylinder

  5. Labeling Volume • When labeling volume, always use units cubed (because you are multiplying 3 measurements) • Example: • If a box is 2 cm long, 3 cm high and 2 cm wide • 2 x 3 x 2 = 12 cm3

  6. Work on these problems • If a box is 5 m long, 3 m wide and 1 m high, what is its volume? 2. If a box is 8 cm long, 4 cm wide and 2 cm high, what is its volume?

  7. What is Density? • Density is a comparison of how much matter there is in a certain amount of space. • Density is found by dividing the object’s mass by its volume. • D = M / V

  8. Which one is more dense? • Demonstration: People in a square • How about this: Which square is more dense?

  9. Which one is more dense? • Now which one is more dense?

  10. What is density? • Density = mass OR mass ÷ volume. volume • Units for density: g cm3 g / cm3 • Why are these the units for density?

  11. Let’s try a density problem together • Frank has a paper clip. It has a mass of 9g and a volume of 3cm3. What is its density? • 3 g/cm3 • Frank also has an eraser. It has a mass of 3g, and a volume of 1cm3. What is its density? 3 g/cm3

  12. Work on these problems with your neighbor. • Jack has a rock. The rock has a mass of 6g and a volume of 3cm3. What is the density of the rock? 2 g/cm3 • Jill has a gel pen. The gel pen has a mass of 8g and a volume of 2cm3. What is the density of the gel pen? • 4 g/cm3

  13. Now, try these on your own. • Alyssa has a watch. It has a mass of 4g and a volume of 2cm3. What is the density of the watch? • 2 g/cm3 • Mia has a wallet. It has a mass of 15g and a volume of 5cm3. What is the density of the wallet? • 3 g/cm3

  14. Liquid Layers • If you pour together liquids that don’t mix and have different densities, they will form liquid layers. • The liquid with the highest density will be on the bottom. • The liquid with the lowest density will be on the top.

  15. Liquid Layers • Check out this picture. Which layer has the highest density? • Which layer has the lowest density? • Imagine that the liquids have the following densities: • 10g/cm3. 3g/cm3. • 6g/cm3. 5g/cm3. • Which number would go with which layer?

  16. Liquid Layers – Try with your neighbor • Which liquid has the highest density? • Which liquid has the lowest density? • Which liquid has the middle density?

  17. Liquid Layers – Try on your own! • Imagine that the liquids on the right have the following densities: • 15g/cm3 10g/cm3 • 3g/cm3 9g/cm3 • 7g/cm3 12g/cm3 • Match the colors to the correct densities. 3g/cm3 7g/cm3 9g/cm3 10g/cm3 12g/cm3 15g/cm3

  18. Review • What is the formula for density? • What happens if you pour together liquids that have different densities? • Will the liquid on the top have the highest or lowest density? • Will the liquid on the bottom have the highest or lowest density?

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