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DENSITY

DENSITY. How dense is dense?. What’s the matter?. Matter exists in 3 main forms: solid liquid and gas. Density is the concentration of matter (atoms) in a substance. Silicon atoms. Density is a ratio. The density of an object is the ratio of its mass (g) to its volume (cm 3 or ml). A. B.

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DENSITY

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  1. DENSITY How dense is dense?

  2. What’s the matter? • Matter exists in 3 main forms: solid liquid and gas. • Density is the concentration of matter (atoms) in a substance. Silicon atoms

  3. Density is a ratio • The density of an object is the ratio of its mass (g) to its volume (cm3 or ml). A B C

  4. Density calculations convert to metric 2.54cm = 1 inch Length = ? Width = ? Height = ? Volume = ? 454g = 1lb Mass = 30.98lb Mass = ? 7 X 3.625 X 1.75in.

  5. Density equation • Density = Mass Volume • D = M V M V D

  6. Density calculations 2.54cm = 1 inch Length = 17.78cm Width = 9.21cm Height = 4.45cm Volume = ? 454g = 1lb Mass = 30.98lb Mass = 14,064.9g 7 X 3.625 X 1.75in.

  7. Work Volume 17.78cm X 9.21cm X 4.45cm = 728.7 cm3 Volume = 728.7 cm3 Mass 30.98lb X 454g = 14,064.9g 1lb Mass = 14,064.9g

  8. More work D = M V D = 14,064.9g 728.7 cm3 D = ?

  9. More work D = M V D = 14,063.9 g 728.7 cm3 D = 19.3 g/cm3

  10. Are we correct?

  11. Effect of phase of matter on density • Most substances increase in density as they change from gas to liquid to solid. • Quite simply, the atoms are closest together in the solid phase. gas E liquid E solid decreasing density increasing density

  12. Water is an exception ice liquid water water vapor • Water is densest as a liquid at 3.98oC. That’s why ice floats.

  13. Size or shape does not affect the density of a substance = same density = same density

  14. Even when cut, the density of a substance remains the same.

  15. Factors that affect density • Temperature • Heat - pushes molecules apart • Cold - pushes molecules together • Pressure • Low - allows molecules to spread apart • High - pushes molecules together • It’s the volume that changes and density is dependent on the ratio d=m v

  16. Float? • If the density of an object is less than the liquid it will float. • The lower the density of an object the higher it will float in the liquid.

  17. Sink? • If the density of an object is greater than that of the liquid, it will sink.

  18. ??? • If an object and a liquid have the same density, the object can remain stationary anywhere in the liquid.

  19. Layering • Liquids of different densities will form layers. http://www.youtube.com/watch?v=-CDkJuo_LYs

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