Density chatt

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Density chatt

  1. 1. Lorraine – You AreMy… DENSITY
  2. 2. Density is… In general – the amount of stuff in a given space. Think population density
  3. 3. Oklahoma New York
  4. 4. Density For science… density is equal to the mass of a thing divided by its volume. What are mass & volume again?  Mass – amount of matter – measured in grams (g)  Volume – amount of space something occupies – measured in cm3 or mL ρ=m/v the units for density are g/cm 3  (or g/mL )
  5. 5. Volume For the easy objects  (length)x(width)x(height)  l x w x h ~ (cm)x (cm)x (cm)=cm3 What about cylinders and cones? What can we do for the not so easy objects???? Here is a clue - displacement
  6. 6. Back to odd shapes… Archimedes?? Do you know him? Was in his bath tub one morning – he noticed that as his body went in to the water – the water rose out of the way. He realized that the volume of H2O that rose was equal to the volume of his body. Legend has it that he ran down the streets of Greece stark naked yelling “Eureka”. – meaning – OMG I’ve Got It.
  7. 7. Eureka… The volume of an object is equal to the volume of H2O it displaces! The implications of this discovery were huge. It was later decided that 1g H2O = 1mL H2O = 1 cm3 H2O So - what is the density of water???
  8. 8. So… If an object has a density <1g/cm3, what will it do if placed in water? If an object has a density >1g/cm3, what will it do if placed in water? If an object has a density =1g/cm3, what will it do if placed in water?
  9. 9. Intrinsic properties Intrinsic properties are properties that can be used to positively identify an object  Like fingerprints, dental records or DNA for human ID Density is an intrinsic property – if you know the density of a metal you can use that to help ID the metal.

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