Volume and density
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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

Volume and Density

**Everything in redshould go in your notes!


What is volume
What is Volume?

  • Volume is the amount of space occupied by an object.

    OR

  • The amount of space something takes up.



Equation for volume
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


Labeling volume
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


Work on these problems
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?


What is density
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


Which one is more dense
Which one is more dense?

  • Demonstration: People in a square

  • How about this: Which square is more dense?


Which one is more dense1
Which one is more dense?

  • Now which one is more dense?


What is density1
What is density?

  • Density = mass OR mass ÷ volume.

    volume

  • Units for density: g

    cm3 g / cm3

  • Why are these the units for density?


Let s try a density problem together
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


  • Work on these problems with your neighbor
    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


    Now try these on your own
    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


  • Liquid layers
    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.


    Liquid layers1
    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?


    Liquid layers try with your neighbor
    Liquid Layers – Try with your neighbor

    • Which liquid has the highest density?

    • Which liquid has the lowest density?

    • Which liquid has the middle density?


    Liquid layers try on your own
    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


    Review
    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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