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Density: Qualitative

Learn about density, which is a comparison of how much matter is in a given space. Discover the concepts of matter, mass, volume, and how they relate to density. Understand the density of solids, liquids, and gases, and why objects float or sink based on their density. Explore the formation of liquid layers and how different densities affect their arrangement.

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Density: Qualitative

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  1. Density: Qualitative

  2. VOCAB YOU MUST KNOW: • Matter: anything that has mass and takes up space (stuff) • Mass: A measurement of the amount of matter (or stuff) in an object or liquid • Volume: A measurement of how much physical space an object or liquid takes up.

  3. What is density? • Density is a comparison of how much matter there is in a certain amount of space. • In other words, density is how much “stuff there is in a given space.” • An object’s density is ALWAYS the same. Whether you have a lot or a little of an object, its density remains the same.

  4. Which one is more dense? • Demonstration: Dots in a square • How about this: Which square is more dense? WHY?

  5. Which one is more dense? • A dry sponge? • Or the same sponge filled with water? • The volume of the wet sponge is _____, • But the mass of the wet sponge is now______, • So it is (more/less) dense than it was when it was dry.

  6. Which one is more dense? • Now which one is more dense? Why?

  7. How to solids and gases compare? • Solids tend to have higher density than liquids because solid atoms are packed more tightly together than liquid atoms • Gases tend to have a lower density than liquids because liquid atoms are packed more tightly together than gas atoms

  8. Why do things float? • Density is the reason an object sinks or floats, regardless of its size. • Ex 1: Both a pencil & a tree trunk float because they are both made of wood.

  9. Liquid Layers • If you pour together liquids that don’t mix and have different densities, they will form liquid layers. • Less dense liquids float on top of more dense liquids. • Lowest density liquid – On top • Highest density liquid – On bottom

  10. Liquid Layers • Check out this picture from your book. 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?

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

  12. 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

  13. Review • 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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