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3.1.1 Parts Per Million


  • 12 one meter sticks (or dowels cut to one meter lengths)
  • masking tape
  • modeling clay
  • thread


  1. Construct a cube out of the meter sticks and masking tape.
  2. Roll out 10 to 15 small spheres of modeling clay, each approximately one centimeter in diameter, representing ozone molecules.
  3. Using thread, suspend each sphere at a random location within the cube.
  4. Calculate how many cubic centimeters there are in a cubic meter. Have students express the relation of the ozone to the cubic meter or atmosphere. (Each sphere represents one part per million of the total volume of the cube.)

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Last Update: 1/18/97
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