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Density Ppt Presentation Transcript

  • 1. BW: Why does ice float in water?
  • 2. What is density? A material's density is defined as its mass per unit volume. It is, essentially, a measurement of how tightly matter is crammed together. The principle of density was discovered by the Greek scientist Archimedes . To calculate the density of an object, take the mass ( m ) and divide by the volume ( v ). This will give you the density in g/cm 3 .
  • 3. Density Large ball – 0.53 g/cm 3 Medium ball – 1.05 g/cm 3 Small ball – 0.82 g/cm 3
  • 4. The “bounceability” of a ball depends on its density, not on its mass or on how big the ball is.
  • 5. Have you wondered why hot air balloons rise? When the air is heated, it becomes less dense until the balloon's total density is less than that of the atmosphere; A hot air balloon is literally floating on the denser, colder air. Why is cold air denser than hot air?
  • 6. Do you know why volcanoes erupt? The main reason that magma rises to the surface to erupt at volcanoes is because it is less dense than the rocks that surround it.
  • 7. A ship floating on water is a great illustration of the difference between mass and density. A ship must have a density of less than 1.0 g/cm 3 (the density of water), or it will sink. Ships have a large mass, because they are made of steel, but because they have a large volume, their density is less than 1.0 g/cm 3 . If enough mass is added to them such that their density goes above 1.0 g/cm 3 , they will sink.
  • 8. You have a rock with a volume of 15cm 3 and a mass of 45 g. What is its density?
  • 9. What is the mass of a 350 cm 3 sample of pure silicon with a density of 2.336 g/cm 3 ? Mass = density x volume x Mass = 2.336 g/cm 3 x 350 cm 3 Mass = 818 grams